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Sigmetnow

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Re: Astronomical news
« Reply #500 on: February 19, 2021, 07:01:16 PM »
If you don’t like outside commentary…
Here’s the clean feed from JPL Mission Control.  EDL (Entry, Descent and Landing) starts after 1:45.  Landing around 1:55.
Mission Control Live: NASA Lands Perseverance Mars Rover (clean feed)
➡️https://www.youtube.com/watch?v=kPrbJ63qUc4

“Watch and listen as signals arrive at Mission Control at NASA's Jet Propulsion Laboratory in Southern California from the Perseverance rover as it lands on Mars.
More Mars 2020 rover and Mars helicopter resources can be found at https://go.nasa.gov/mars2020toolkit
Credit: NASA-JPL/Caltech”

—-
Per the post-landing news conference, Percy should have recorded many photos and movies during EDL, which will gradually be uploaded over the next few days.

Fun fact:  Percy’s backup computer is named “Second Chance.” ;D

NASA’s interactive simulation can be found here:  https://eyes.nasa.gov

The Al Chen of Mars 2020:
The face of the Perseverance landing was an Indian American woman 
https://www.cnn.com/2021/02/19/world/swati-mohan-nasa-perseverance-landing-scn-trnd/index.html
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Sigmetnow

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Re: Astronomical news
« Reply #501 on: February 19, 2021, 07:12:43 PM »
Haha.  Just posted:
Quote
Michael Baylor (@nextspaceflight)2/19/21, 1:04 PM
New image from @NASAPersevere!
It shows the rover being lowered to the surface of Mars by the sky crane.
https://twitter.com/nextspaceflight/status/1362825522602934272

Mars Reconnaissance Orbiter photographed the landing from Mars orbit!
https://twitter.com/nextspaceflight/status/1362826055476649984
⬇️⬇️ Images below.
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vox_mundi

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Re: Astronomical news
« Reply #502 on: February 19, 2021, 11:24:32 PM »


Coral or volcanic rock?

... Already, scientists are finding things in the first images from Perseverance to get excited about. An engineering image taken to assess the vehicle's wheels, for example, showed curious-looking rocks in the background. "The science team is already thinking a lot about this," said Hallie Gengl, instrument data systems operation lead for the Multimission Image-Processing Laboratory at NASA's Jet Propulsion Laboratory.

https://arstechnica.com/science/2021/02/nasa-releases-exhilarating-image-of-mars-rover-just-above-the-planet/
« Last Edit: February 20, 2021, 01:42:51 AM by vox_mundi »
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vox_mundi

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Re: Astronomical news
« Reply #503 on: February 20, 2021, 01:45:33 AM »
“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

Insensible before the wave so soon released by callous fate. Affected most, they understand the least, and understanding, when it comes, invariably arrives too late

Sigmetnow

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Re: Astronomical news
« Reply #504 on: February 21, 2021, 02:31:20 AM »
Mars Perseverance
Emily Lakdawalla, who knows a thing or two about Mars rovers, comments on the strange lack of Mars Perseverance photos being released — the post-landing press conference mentioned they had “too many to count.”   Although there is no indication there is a problem with the rover, this decision is unusual, compared to prior Mars missions.  The “political” theory is that NASA wants tighter than usual control over the release of the photos, perhaps preparing for a splashy reveal event on Monday.  (The “conspiracy” theory is that the photos showed clear evidence of Martian life, so they have to decide what to do next. ;) )

Quote
Emily Lakdawalla (@elakdawalla) 2/20/21, 4:36 PM
It is now 2 full sols after @NASAPersevere landed, and still there are no raw images being posted at mars.nasa.gov/mars2020/multi… . On every previous Mars mission since the MERs landed in 2004, these pages have given us all views of the daily operations of @NASA's Mars missions.
➡️ https://twitter.com/elakdawalla/status/1363241256709730310
Thread continues at the link.

The full thread can also be accessed here:
https://threadreaderapp.com/thread/1363241256709730310.html
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vox_mundi

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Re: Astronomical news
« Reply #505 on: February 21, 2021, 03:00:09 AM »


... the Jawas took it; they thought it was discarded scrap. They have a couple of droids to trade, though ...
“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

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Sigmetnow

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Re: Astronomical news
« Reply #506 on: February 21, 2021, 05:31:36 PM »
... the Jawas took it; they thought it was discarded scrap. They have a couple of droids to trade, though ...

Haha. 

But NASA is leaving itself wide open for viral fakery like this:

The viral Mars Perseverance rover video going around is fake
https://mashable.com/article/mars-perseverance-fake-video/
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vox_mundi

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Re: Astronomical news
« Reply #507 on: February 22, 2021, 04:40:16 PM »
NASA will provide an update on its Perseverance rover, which landed on Mars on Feb. 18, in a news briefing Monday (Feb. 22) at 2 p.m. EST (1900 GMT). You can watch it live courtesy of NASA TV.

“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

Insensible before the wave so soon released by callous fate. Affected most, they understand the least, and understanding, when it comes, invariably arrives too late

Sigmetnow

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Re: Astronomical news
« Reply #508 on: February 22, 2021, 07:09:12 PM »
NASA will also be hosting a live Reddit “Ask Me Anything” two hours later.

Quote
NASA (@NASA) 2/22/21, 11:13 AM
Today, we'll release first-of-its-kind video from @NASAPersevere's Feb. 18 touchdown on Mars: go.nasa.gov/2Nl4xzZ

• 2pm ET (19:00 UTC): live news update unveiling video & images

• 4pm ET (21:00 UTC): @reddit AMA with mission experts

Ask questions using #CountdownToMars
https://twitter.com/nasa/status/1363884510396510211
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Sigmetnow

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Re: Astronomical news
« Reply #509 on: February 22, 2021, 09:12:36 PM »
THE VIDEO.  At the link.
Quote
NASA JPL (@NASAJPL) 2/22/21, 2:14 PM
JUST, WOW.
Grab the popcorn because the @NASAPersevere rover has sent us a one-of-kind video of her Mars landing. For the first time in history, we can see multiple angles of what it looks like to touch down on the Red Planet. #CountdownToMars
https://twitter.com/nasajpl/status/1363930124547022848
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Sigmetnow

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Re: Astronomical news
« Reply #510 on: February 22, 2021, 09:55:12 PM »
Al Chen: we missed our targeted landing pixel by only 5 meters.
Received:  30 GB of data, 23,000 images.
Perseverance, or “Percy” is being referred to as “she,” (being a ship of sorts).

Eric Berger:
If you could remove your helmet on Mars, this is what it would sound like. You'd also be dead. But still.
Sounds From Mars: Filters Out Rover Self-Noise by NASA
https://soundcloud.com/nasa/first-sounds-from-mars-filters-out-rover-self-noise

Here's a link to the Mars Perseverance landing video on NASA's YouTube page.
Perseverance rover’s descent and touchdown on Mars (official NASA video)


360-degree panorama image of Mars, taken on Saturday by Perseverance.
https://photojournal.jpl.nasa.gov/catalog/PIA24422

Raw images:
Images from the Mars Perseverance Rover - NASA Mars
https://mars.nasa.gov/mars2020/multimedia/raw-images/

Mission updates:
Nasa.gov/perseverance
Mars.nasa.gov/perseverance

Eric Berger:
The production quality of faking landings on other worlds has come a long way since 1969. [;)]
⬇️ Image below.  From rover cam, looking up at the sky crane as it lowers the rover to the surface.  The rocket flames are invisible, due to the fuel used!
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Sigmetnow

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Re: Astronomical news
« Reply #511 on: February 23, 2021, 02:58:30 PM »
'Dare mighty things': hidden message found on Nasa Mars rover parachute
Social media users say message is encoded in red-and-white pattern on parachute
https://www.theguardian.com/science/2021/feb/23/dare-mighty-things-hidden-message-found-on-nasa-mars-rover-parachute
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vox_mundi

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Re: Astronomical news
« Reply #512 on: February 23, 2021, 05:10:47 PM »
Martian Moons Have a Common Ancestor
https://phys.org/news/2021-02-martian-moons-common-ancestor.html



Mars's two moons, Phobos and Deimos, have puzzled researchers since their discovery in 1877. They are very small: Phobos's diameter of 22 kilometers is 160 times smaller than that of our moon, and Deimos is even smaller, with a diameter of only 12 kilometers.

This led people to suspect that they might in fact be asteroids that were captured in Mars's gravity field. "But that's where the problems started," Bagheri says. Captured objects would be expected to follow an eccentric orbit around the planet, and that orbit would be at a random inclination. In contradiction to this hypothesis, the orbits of the Martian moons are almost circular and move in the equatorial plane of Mars. So, what is the explanation for the current orbits of Phobos and Deimos?

"The idea was to trace the orbits and their changes back into the past," says Amir Khan, a Senior Scientist at the Physics Institute of the University of Zurich and the Institute of Geophysics at ETH Zurich. As it turned out, the orbits of Phobos and Deimos appeared to have crossed in the past. "This means that the moons were very likely in the same place and therefore have the same origin," Khan says. The researchers concluded that a larger celestial body was orbiting Mars back then. This original moon was probably hit by another body and disintegrated as a result. "Phobos and Deimos are the remainders of this lost moon," says Bagheri, who is lead author of the study now published in the journal Nature Astronomy.

Using these findings and their refined theory on the tidal effects, the researchers ran hundreds of computer simulations to track the orbits of the moons backward in time until they reached the intersection—the moment Phobos and Deimos were born. Depending on the simulation, this point in time lies between 1 and 2.7 billion years in the past. "The exact time depends on the physical properties of Phobos and Deimos, that is, how porous they are" Bagheri says. A Japanese probe scheduled for launch in 2025 will explore Phobos and return samples to Earth. The researchers expect that these samples will provide the needed details about the interior of the Martian moons that will enable more precise calculations of their origin.

Amirhossein Bagheri et al. Dynamical evidence for Phobos and Deimos as remnants of a disrupted common progenitor, Nature Astronomy (2021).
https://www.nature.com/articles/s41550-021-01306-2
“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

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Sigmetnow

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Re: Astronomical news
« Reply #513 on: February 24, 2021, 02:22:41 AM »
Sunset on Mars.
Amazing to be alive at this time to witness this.
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Sigmetnow

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Re: Astronomical news
« Reply #514 on: February 24, 2021, 04:23:13 PM »
—- Moon exploration plans
ESA
ESA plans mission to explore lunar caves
Quote
In a first step towards uncovering the Moon's subterranean secrets, in 2019 we asked for your ideas to detect, map and explore lunar caves. Five ideas were selected to be studied in more detail, each addressing different phases of a potential mission.

Through these five Sysnova studies, three mission scenarios were developed – one to perform a preliminary scout of entry pits and underground caves from the Moon's surface, one to lower a probe into a pit and access the first part of a cave, and one to explore an underground lava tube using autonomous rovers. …
https://www.esa.int/Enabling_Support/Preparing_for_the_Future/Discovery_and_Preparation/ESA_plans_mission_to_explore_lunar_caves

China
Quote
Andrew Jones (@AJ_FI) 2/22/21, 8:34 AM Xi Jinping met representatives of scientists/engineers involved in Chang'e-5 lunar sample return in Beijing Monday. Notably: Xi stressed pushing forward the 4th phase of lunar exploration (south pole CE-6, 7, 8, IRLS) & embarking on a new journey in planetary exploration. i:CCTV
https://twitter.com/aj_fi/status/1363844535852412929

Andrew Jones:
Xi apparently sees CE-5 seen as an important milestone and of great significance to the development of China's aerospace industry, as part of overall national development. An indication of the apparent awareness of the significance of space for China and level of backing.

< I think we still haven't seen photos of the returned [moon dust] samples yet... or am I wrong?
Fankang Meng (@FankangMeng)2/22/21, 8:36 AM
➡️ https://twitter.com/fankangmeng/status/1363845047947563011
Image at link. 
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Sigmetnow

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Re: Astronomical news
« Reply #515 on: February 24, 2021, 07:52:15 PM »
Perseverance on Mars
Quote
Prof. Paul Byrne (@ThePlanetaryGuy) 2/24/21, 10:34 AM
THIS IS THE SKYCRANE EXPLODING [ON IMPACT]!!!

Possibly.

One of the very first images returned by @NASAPersevere shows what looks like a plume far from the rover, in the direction where the Descent Stage flew.

A final image to celebrate a hero.
https://twitter.com/theplanetaryguy/status/1364599685462319113

Prof. Paul Byrne:
This image was acquired from the Right Rear HazCam almost immediately after the rover landed, to verify a safe landing. Most of the image is missing, and I modified it to account for the lens distortion.

h/t @doug_ellison for spotting it first!

Quote
SarcasticRover (@SarcasticRover) 2/18/21, 3:52 PM
You either land in a crater, or you make one.

That's the Martian way.
https://twitter.com/sarcasticrover/status/1362505404874252289
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vox_mundi

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Re: Astronomical news
« Reply #516 on: February 25, 2021, 12:33:03 AM »


Interactive 4K view of Perseverance’s Mars landing site
“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

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vox_mundi

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Re: Astronomical news
« Reply #517 on: February 26, 2021, 02:40:00 PM »
What Geologists See When They Look at Perseverance's Landing Site
https://phys.org/news/2021-02-geologists-perseverance-site.html



We've sent the Perseverance rover on a Mars field trip; but if a geologist were along for the ride, what would it look like to them?

NASA chose the Jezero Crater for Perseverance's mission partly because of its geology.  ... Jezero Crater was a lake at one time in its past, possibly twice, according to some research. Scientists who study Jezero say the lake probably formed when there was a period of continual surface runoff. Two incoming watercourses fed the lake, and overflow carved a channel out of the lake.

Perseverance landed near the western side of the crater, near the clearly visible river delta. That river sediment contains ancient clays, which are especially good at trapping and preserving organic matter. If a real live geologist were along for the ride with Perseverance, they would likely head straight for those clays.

The river sediment is piled so high that its edge is like a cliff. Perseverance will traverse along the bottom of that cliff before working its way up and across the delta, hopefully making it to the ancient shoreline. Then, depending on mission length, the rover would climb Jezero's 610 meters (200 ft.) crater rim and explore some of the plains surrounding the crater. Perseverance's prime mission length is about one Mars year (about two Earth years) and NASA thinks that it could complete about half of this traverse during that time.



As the images show, the Jezero Crater lies on the border between different geological areas of different ages. The Terra Sabaea highland region contains rocks from Mars' Palaeozoic (the Noachian: 4.1–3.7 billion years ago). The Isidis impact basin dates from the same time. The Isidis Planitia plain is much younger, dating back to the Hesperian (3.7–3.0 billion years ago) and the Martian Modern (the Amazonian 3.0 billion years to the present day). The result is that rocks and other deposits around Jezero Crater come from each of the three Martian geological epochs. To a geologist, this is a big rocky bonanza.

The nearby Syrtis Major is a volcanic province whose lava flows also date to the Hesperian. The Nili Fossae region is a trough system that was formed by the shocks from the Isidis impact. This is a geologist's dream field trip. If Perseverance can complete its primary mission, it will explore some of the regions outside the Jezero crater

Of particular interest are agglomerate debris called megabreccia that formed during the Isidis impact. They're located west of Jezero in Noachian bedrock, igneous bedrock, and lava flows from Syrtis Major. Megabreccias can be very large, up to a kilometre across, and can hold valuable clues to Mars' early history.



--------------------------------------------

“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

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Sigmetnow

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Re: Astronomical news
« Reply #518 on: February 26, 2021, 05:38:35 PM »
Mars Navigation
Quote
Jay L. DeShetler (@jdeshetler) 2/26/21, 10:35 AM
Mars Perseverance Rover's Down-Look Camera, 100 seconds of descent overlapped with the HiRISE's imaging map using the green dot as target landing site. The 2nd clip is speed up by 8x.
➡️ https://twitter.com/jdeshetler/status/1365324539744251905
2-minute vid at the link.


The Visible Mars
Quote
A full rotation of the planet Mars (Hubble Captures By NASA) 
➡️ https://twitter.com/konstructivizm/status/1364950780424388616


Not sure who-all can view this new video program.  It’s the How and Why about the Perseverance rover.
PBS: Nova episode:  Looking for life on Mars
https://www.pbs.org/wgbh/nova/video/looking-for-life-on-mars/
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be cause

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Re: Astronomical news
« Reply #519 on: March 01, 2021, 01:37:33 PM »
 I went out for a little star gazing last night . first I see a satellite traversing NW-SE . A minute later 2 pass the N end of Orion heading NE . These are followed by 4 more in the next 2 minutes , all on the same track .. the night sky is getting busy .. b.c.
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 + 2 = 2021 + 1 =  ' if only we could have seen it coming ' ...

Sigmetnow

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Re: Astronomical news
« Reply #520 on: March 01, 2021, 04:29:09 PM »
Peace offering?

From Oman to Mars: A meteorite's journey back home
Quote
U.S. Space agency NASA had a unique payload onboard its Perseverance rover that touched down on the Martian surface recently. 'Sayh Al Uhaymir 008', a meteorite fragment from the Red Planet, which found its way to Oman, has been returned onboard the rover, a world-first.

"After detailed chemical examination at the Max Planck laboratory in Germany, researchers found evidence that the meteorite rock 'Sayh Al Uhaymir 008' belonged to Mars." The meteorite fragment weighs more than eight kilograms. It is estimated to have reached Earth 450 million years ago due to a cosmic development involving the collision of an asteroid or comet with the planet Mars.
 …
When work on the Perseverance project, scientists suggested using a Martian meteorite found on Earth to help in processing images captured by the rover into their true colours and textures, without being affected by any natural conditions. It was also decided that the Martian meteorite would act directly as a calibration target instead of a piece of metal or coloured pieces with specific colours used for the purpose as usual, NASA said. 
https://timesofoman.com/article/from-oman-to-mars-a-meteorites-journey-back-home
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Sigmetnow

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Re: Astronomical news
« Reply #521 on: March 03, 2021, 03:09:17 PM »
Radiation- and Temperature-hardened, they’ve been powering earth satellites for years.
A 1990s iMac Processor Powers NASA’s Perseverance Rover
https://gizmodo.com/a-1990s-imac-processor-powers-nasa-s-perseverance-rover-1846380844
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vox_mundi

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Re: Astronomical news
« Reply #522 on: March 03, 2021, 04:43:26 PM »


Perseverance can be seen in this enhanced colour image at its landing site, six days after touchdown. You can see the two bright zones to the sides of the rover that have been scoured clear by the descent stage rockets and the dark material appears to have been funnelled outward both in front and behind the rover.
“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

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Sigmetnow

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Re: Astronomical news
« Reply #523 on: March 05, 2021, 03:40:14 PM »
Quote
NASA's Perseverance Mars Rover (@NASAPersevere) 3/4/21, 11:55 AM
Now that the team and I have achieved a series of “firsts” since my landing on the Red Planet, join a discussion on Friday, March 5, at 12:30 pm PT (3:30 pm ET/2030 UTC) focused on those big moments and get a look at what comes next as I start roving.

‘Firsts’ Achieved Since NASA’s Perseverance Mars Rover Landing (News Audio + Visuals) - YouTube
https://www.youtube.com/watch?v=AYXQFnrVJFQ&feature=youtu.be 

Watch Perseverance rover pulling its first moves on Mars
March 4, 2021 9:30PM PST
Quote
Following two weeks of self-administered health checks on the surface of Mars, NASA’s Perseverance rover is close to beginning its highly anticipated hunt for signs of past life on the far-off planet.

Two posts on the rover’s official Twitter account on Thursday, March 4, showed the high-tech mobile laboratory pulling a few moves as part of crucial tests to ensure everything’s in good working order following the vehicle’s six-and-a-half-month journey from Earth. …
https://www.digitaltrends.com/news/watch-perseverance-rover-pulling-its-first-moves-on-mars/
⬇️
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Sigmetnow

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Re: Astronomical news
« Reply #524 on: March 06, 2021, 04:17:36 PM »
Quote
Navcam view of Mont Mercou, a ~7m cliff face that @MarsCuriosity is currently nudging up to as it's next drill site. Taken on Sol 3049
https://twitter.com/kevinmgill/status/1367958634144002049
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Sigmetnow

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Re: Astronomical news
« Reply #525 on: March 06, 2021, 07:52:54 PM »
A large asteroid known as Apophis zipped past the Earth
March 6, 2021
Quote
On Friday, a large asteroid roughly the size of the Eiffel Tower zipped past the Earth. The asteroid posed no hazard to the Earth on this flyby as it was more than 40 times as far away from Earth as the moon. However, on April 13, 2029, Apophis will get much closer to the Earth. …
https://www.slashgear.com/a-large-asteroid-known-as-apophis-zipped-silently-past-the-earth-06662496/

Asteroids are nature’s way of asking, “How’s that space program coming?“
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Sigmetnow

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Re: Astronomical news
« Reply #526 on: March 09, 2021, 07:58:00 PM »
This one knocked on earth’s door.

Sunday afternoon
Meteor seen over New England, Canada explodes with force of 440 lbs of TNT
https://www.foxnews.com/science/fireball-seen-over-new-england-canada-explodes-with-force-of-440-lbs-of-tnt
The space rock "fragmented violently, producing a pressure wave that rattled buildings and generated the sound heard by those near the trajectory."
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vox_mundi

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Re: Astronomical news
« Reply #527 on: March 09, 2021, 08:53:06 PM »
Re: Apophis



Apophis is 1,120 feet wide (roughly three-and-a-half football fields) making it as wide as the Eiffel Tower is tall.

It’s so large, and it’s flyby will be so close, that those on the ground will be able to witness it with their naked eye. It’ll be closest to Earth at around 6pm ET on April 13, 2029, crossing the Atlantic ocean in just an hour. At some point, it will travel the entire width of the full Moon in a single minute and get as bright as the Little Dipper.

----------------------------------------------

Impact In 2068

https://forum.arctic-sea-ice.net/index.php/topic,2449.msg291184.html#msg291184
« Last Edit: March 10, 2021, 01:10:27 AM by vox_mundi »
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vox_mundi

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Re: Astronomical news
« Reply #528 on: March 09, 2021, 10:18:12 PM »
Serendipitous Juno Detections Shatter Ideas About Origin of Zodiacal Light
https://phys.org/news/2021-03-serendipitous-juno-shatter-ideas-zodiacal.html



J. L. Jorgensen et al. Distribution of Interplanetary Dust Detected by the Juno Spacecraft and Its Contribution to the Zodiacal Light, Journal of Geophysical Research: Planets (2020)
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JE006509

... The Zodiacal light is sunlight reflected by dust in the inner solar system. Variations in the Zodiacal light with ecliptic latitude reveal discrete bands of dust orbiting near the ecliptic plane. The Juno spacecraft, in transit from earth to Jupiter, recorded a sufficient number of impacts with this dust to characterize their distribution in space for the first time. The radial distribution of the dust suggests a primary source of dust with the orbital elements (inclination and eccentricity) of Mars, scattered into a secondary population at higher inclination to the ecliptic. The resulting population accounts for the observed variation of Zodiacal light with ecliptic latitude.

----------------------------------------------------

... left overs from dust storms or the formation of Phobos and Deimos?
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vox_mundi

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Re: Astronomical news
« Reply #529 on: March 09, 2021, 11:01:49 PM »
Breaking the Warp Barrier for Faster-Than-Light Travel
https://phys.org/news/2021-03-warp-barrier-faster-than-light.html



If travel to distant stars within an individual's lifetime is going to be possible, a means of faster-than-light propulsion will have to be found. To date, even recent research about superluminal (faster-than-light) transport based on Einstein's theory of general relativity would require vast amounts of hypothetical particles and states of matter that have 'exotic' physical properties such as negative energy density. This type of matter either cannot currently be found or cannot be manufactured in viable quantities. In contrast, new research carried out at the University of Göttingen gets around this problem by constructing a new class of hyper-fast 'solitons' using sources with only positive energies that can enable travel at any speed. This reignites debate about the possibility of faster-than-light travel based on conventional physics. The research is published in the journal Classical and Quantum Gravity.

The author of the paper, Dr. Erik Lentz, analyzed existing research and discovered gaps in previous 'warp drive' studies. Lentz noticed that there existed yet-to-be explored configurations of space-time curvature organized into 'solitons' that have the potential to solve the puzzle while being physically viable.

A soliton—in this context also informally referred to as a 'warp bubble'—is a compact wave that maintains its shape and moves at constant velocity. Lentz derived the Einstein equations for unexplored soliton configurations (where the space-time metric's shift vector components obey a hyperbolic relation), finding that the altered space-time geometries could be formed in a way that worked even with conventional energy sources. In essence, the new method uses the very structure of space and time arranged in a soliton to provide a solution to faster-than-light travel, which—unlike other research—would only need sources with positive energy densities. No exotic negative energy densities needed.

If sufficient energy could be generated, the equations used in this research would allow space travel to Proxima Centauri, our nearest star, and back to Earth in years instead of decades or millennia. That means an individual could travel there and back within their lifetime. In comparison, the current rocket technology would take more than 50,000 years for a one-way journey. In addition, the solitons (warp bubbles) were configured to contain a region with minimal tidal forces such that the passing of time inside the soliton matches the time outside: an ideal environment for a spacecraft. This means there would not be the complications of the so-called 'twin paradox' whereby one twin traveling near the speed of light would age much more slowly than the other twin who stayed on Earth: in fact, according to the recent equations both twins would be the same age when reunited.



"This work has moved the problem of faster-than-light travel one step away from theoretical research in fundamental physics and closer to engineering. The next step is to figure out how to bring down the astronomical amount of energy needed to within the range of today's technologies, such as a large modern nuclear fission power plant. Then we can talk about building the first prototypes," says Lentz.

Erik W Lentz, Breaking the warp barrier: hyper-fast solitons in Einstein–Maxwell-plasma theory, Classical and Quantum Gravity (2021)
https://iopscience.iop.org/article/10.1088/1361-6382/abe692

-------------------------------------------

Microscopic Wormholes Possible In Theory
https://phys.org/news/2021-03-microscopic-wormholes-theory.html

Wormholes play a key role in many science fiction films—often as a shortcut between two distant points in space. In physics, however, these tunnels in spacetime have remained purely hypothetical. An international team led by Dr. Jose Luis Blázquez-Salcedo of the University of Oldenburg has now presented a new theoretical model in the science journal Physical Review Letters that makes microscopic wormholes seem less far-fetched than in previous theories.

... Previous models suggest that the only way to keep the wormhole open is with an exotic form of matter that has a negative mass, or in other words weighs less than nothing, and which only exists in theory. However, Blázquez-Salcedo and his colleagues Dr. Christian Knoll from the University of Oldenburg and Eugen Radu from the Universidade de Aveiro in Portugal demonstrate in their model that wormholes could also be traversable without such matter.

The researchers chose a comparatively simple "semiclassical" approach. They combined elements of relativity theory with elements of quantum theory and classic electrodynamics theory. In their model they consider certain elementary particles such as electrons and their electric charge as the matter that is to pass through the wormhole. As a mathematical description, they chose the Dirac equation, a formula that describes the probability density function of a particle according to quantum theory and relativity as a so-called Dirac field.

As the physicists report in their study, it is the inclusion of the Dirac field into their model that permits the existence of a wormhole traversable by matter, provided that the ratio between the electric charge and the mass of the wormhole exceeds a certain limit. In addition to matter, signals—for example electromagnetic waves—could also traverse the tiny tunnels in spacetime.

Jose Luis Blázquez-Salcedo et al, Traversable Wormholes in Einstein-Dirac-Maxwell Theory, Physical Review Letters (2021)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.101102

------------------------------------------

Flight through a Wormhole
https://www.spacetimetravel.org/wurmlochflug/wurmlochflug.html

------------------------------------------



360° Traversing a flat Worm Hole
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Sigmetnow

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Re: Astronomical news
« Reply #530 on: March 11, 2021, 04:09:26 AM »
NASA preparing to fly Ingenuity Mars drone, enabling future airborne missions
March 10, 2021
Quote
As NASA’s newest Mars rover, Perseverance, continues its own checkouts and tests, work is starting for a new phase of the mission – the Ingenuity helicopter. This first-of-its-kind piece of hardware will demonstrate (non-rocket) powered flight on a world other than Earth for the first time. Data from these flights – expected to begin in 30-60 days – will help to develop future programs for missions to Mars and beyond. …
https://www.nasaspaceflight.com/2021/03/nasa-preparing-ingenuity-enabling-future-missions/
Includes a brief video demonstrating the steps to release the helicopter from its protected compartment on Perseverance.
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Sigmetnow

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Re: Astronomical news
« Reply #531 on: March 12, 2021, 08:07:17 PM »
Who Would Kidnap a Space Telescope?
Quote
NASA’s new space telescope has had a rough go. Name a problem, and this telescope—meant to be the most powerful of its kind, a worthy successor to the famous Hubble—has faced it: poor management, technical errors, budget overruns, schedule delays, and a pandemic. So, naturally, the people responsible for the telescope’s safety are now thinking about pirates.

Yes, pirates.

The topic came up at a recent meeting about NASA’s James Webb space telescope, named for a former administrator of the space agency. Later this year, the telescope will travel by ship to a launch site in South America, passing through the Panama Canal to reach French Guiana. Webb, with a mirror as tall as a two-story building and a protective shield the size of a tennis court, is too large for a plane. Its departure date will be kept secret, someone said at the meeting, to protect against pirates who might want to capture the precious cargo and hold it for ransom. Christopher Conselice, an astrophysicist at the University of Manchester who attended the meeting, was at first baffled by the concern because, well, pirates, but it quickly clicked.

“Why would you announce that you’re going to be shipping on a certain day something that is worth over $10 billion,” he explained to me, “that you could easily put in a boat” and sail away with? …
https://www.msn.com/en-us/news/technology/who-would-kidnap-a-space-telescope/ar-BB1ewbb4
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kassy

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Re: Astronomical news
« Reply #532 on: March 12, 2021, 08:15:11 PM »
Who would buy that of you?
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Sigmetnow

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Re: Astronomical news
« Reply #533 on: March 13, 2021, 05:20:15 PM »
Who would buy that of you?

 ;D  Well, the mirrors are coated in gold....  But the most value would be in demanding NASA pay a ransom to get it back.  Not that NASA has lots of spare cash lying around, so... yeah.  Aspiring pirates should think twice.
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vox_mundi

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Re: Astronomical news
« Reply #534 on: March 16, 2021, 06:29:21 PM »
Researcher Theorizes Worlds With Underground Oceans Support, Conceal Life
https://phys.org/news/2021-03-theorizes-worlds-underground-oceans-conceal.html

In a report presented at the 52nd annual Lunar and Planetary Science Conference (LPSC 52) this week, Southwest Research Institute planetary scientist S. Alan Stern writes that the prevalence of interior water ocean worlds (IWOWs) in our solar system suggests they may be prevalent in other star systems as well, vastly expanding the conditions for planetary habitability and biological survival over time.



"Interior water ocean worlds are better suited to provide many kinds of environmental stability, and are less likely to suffer threats to life from their own atmosphere, their star, their solar system, and the galaxy, than are worlds like Earth, which have their oceans on the outside," said Stern.

He also points out that the same layer of rock and ice that protects the oceans on IWOWs also conceals life from being detected by virtually all astronomical techniques. If such worlds are the predominant abodes of life in the galaxy and if intelligent life arises in them—both big "ifs," Stern emphasizes—then IWOWs may also help crack the so-called Fermi Paradox.

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Sigmetnow

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Re: Astronomical news
« Reply #535 on: March 17, 2021, 02:09:09 AM »
—- Hubble telescope
Software reset. Now using backup motor to open and close the aperture door.
Hubble returned to operational service, showcases exoplanet’s second atmosphere
 March 16, 2021
Quote
The Hubble Space Telescope recently garnered headlines for a software anomaly that caused the iconic observatory to enter safe mode as its control teams worked to successfully restore the telescope to operational status.

While Hubble is showing its age, scientists using the observatory are nonetheless continuing to produce incredible scientific discoveries, including a recent announcement surrounding an exoplanet 41 light years away that is on its second atmosphere. …
https://www.nasaspaceflight.com/2021/03/hubble-return-service-exoplanet-second-atmosphere/
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Sigmetnow

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Re: Astronomical news
« Reply #536 on: March 18, 2021, 03:13:55 PM »
Quote
NASA's Perseverance Mars Rover:
Hear that? That’s the sound of me driving over Martian rocks. This is the first time we’ve captured sounds while driving on Mars.

Read full story: go.nasa.gov/3ly2OE4   
https://twitter.com/nasapersevere/status/1372294898804690944
90 sec audio clip at the Twitter link
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kassy

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Re: Astronomical news
« Reply #537 on: March 20, 2021, 06:33:38 PM »
Echoes From a Comet That Crashed in 1994 Have Revealed New Data on Jupiter

It collided with Jupiter in 1994, but Comet Shoemaker-Levy 9 still apparently has things to teach us about the Solar System's largest planet.

A new analysis of the traces of the comet's impact – still zooming around Jupiter's atmosphere – has yielded the first direct measurement of the gas giant's powerful stratospheric winds, in the cloudless middle layer of the atmosphere.

There, narrow bands of wind known as jets – like Earth's jet streams – blow at up to 400 meters per second at high latitudes. That's around 1,440 kilometers per hour (895 mph) – vastly outstripping the top wind speeds of around 620 km/h seen in the Great Red Spot cyclonal storm.

The team's detection and analysis suggest that these jets could act like a colossal vortex, about 50,000 kilometers in diameter and 900 kilometers high.

...

The comet impact also added new molecules that weren't already present on Jupiter. These included ammonia – which disappeared within a few months – and hydrogen cyanide, which can still be detected in the Jovian stratosphere to this day.

It was this hydrogen cyanide that a team of scientists tracked using 42 of the 66 antennas of the Atacama Large Millimeter/Submillimeter Array in Chile. Using this powerful instrument, astronomers observed the Doppler shift of the hydrogen cyanide – the way the wavelength of the molecule's electromagnetic emission lengthens or shortens depending on whether it's moving away from or towards the observer.

"By measuring this shift, we were able to deduce the speed of the winds much like one could deduce the speed of a passing train by the change in the frequency of the train whistle," said planetary scientist Vincent Hue of the Southwest Research Institute in the US.

...

One of the most intriguing jets, though, was found directly below Jupiter's permanent auroral oval, several hundreds of kilometers below the auroral winds. It was clockwise in the north and anti-clockwise in the south, at speeds of up to 300 to 400 meters per second. The team thinks that this jet is the lower tail of the auroral wind.

Previous studies had predicted that the auroral winds would decrease in strength as altitude decreased, dissipating before reaching the stratosphere, so this was a surprise – a beautiful demonstration of the unseen atmospheric complexity in a planet we already knew was insanely atmospherically complex.

...

https://www.sciencealert.com/comet-shoemaker-levy-9-has-revealed-something-new-about-jupiter
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vox_mundi

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Re: Astronomical news
« Reply #538 on: March 21, 2021, 03:02:58 PM »
“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.” ― Leonardo da Vinci

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morganism

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Re: Astronomical news
« Reply #539 on: March 22, 2021, 06:43:59 AM »
in case you like your planetary geology..

52nd Lunar and Planetary Science Conference

March 15-19, 2021
Program and Abstracts

https://www.hou.usra.edu/meetings/lpsc2021/pdf/lpsc2021_program.htm#sess253


Sigmetnow

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Re: Astronomical news
« Reply #540 on: March 22, 2021, 02:29:20 PM »
Space debris removal demonstration launches
Quote
Astroscale launched what it calls Elsa-D (End-of-Life Service by Astroscale demonstration). The demonstration mission consists of two spacecraft: a 175kg "servicer" and a 17kg "client".

On the Soyuz, the duo were connected, but in the coming weeks they will be commanded to separate to begin a repeating game of cat and mouse. The servicer will use its sensors to find and chase down the client, latching on to it using a magnetic docking plate, before then releasing "the mouse" for another capture experiment. The task will become increasingly complex, with the most difficult rendezvous requiring the servicer to grab the client as it's tumbling.

Ultimately, the pair will be commanded to come out of orbit to burn up in the atmosphere.

"The mission simulates a scenario where we would rendezvous with, and dock with, and capture a piece of debris that is free-floating in space," explained Astroscale chief technical officer Mike Lindsay.

"We would then lower the debris, such that it re-enters Earth's atmosphere and stays out of the way of other spacecraft and operations," he told BBC News. ...
https://www.bbc.com/news/science-environment-56482726
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vox_mundi

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Re: Astronomical news
« Reply #541 on: March 23, 2021, 02:25:00 PM »
Mont Mercou on Mars
https://phys.org/news/2021-03-image-mont-mercou-mars.html



Other pictures at the link
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Sigmetnow

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Re: Astronomical news
« Reply #542 on: March 25, 2021, 01:18:51 AM »
Mars helicopter Ingenuity carries piece of Wright brothers' famous plane
Quote
A tiny piece of the Wright brothers' history-making plane will take to the skies on Mars a few weeks from now, if all goes according to plan.

NASA's Mars Helicopter Ingenuity, which could lift off on the Red Planet as soon as April 8, bears a tiny swatch of fabric from one wing of Flyer 1, the plane that in December 1903 made the first powered flights on Earth, agency officials announced Tuesday (March 23).

The Wright brothers ushered in "aerial mobility as a dimension for us to be able to travel here on Earth," Bob Balaram, Ingenuity chief engineer at NASA's Jet Propulsion Laboratory (JPL) in Southern California, said during a news conference Tuesday. "In the same way, we are hoping that Ingenuity also allows us to expand and open up aerial mobility on Mars."

The Flyer 1 swatch, which is about the size of a postage stamp, is attached to a small cable beneath Ingenuity's solar panel, Balaram added.
...

Ingenuity isn't the first pioneering NASA craft to carry a piece of Flyer 1 beyond Earth.

"A different piece of the [fabric] material, along with a small splinter of wood, from the Flyer 1 was flown to the moon and back aboard Apollo 11," NASA officials wrote in a statement. ...
https://www.space.com/mars-helicopter-ingenuity-wright-brothers-plane
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vox_mundi

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Re: Astronomical news
« Reply #543 on: March 25, 2021, 03:20:44 PM »
Previously Thought to Be Science Fiction, a Planet In a Triple-Star System Has Been Discovered
https://sciencex.com/news/2021-03-previously-thought-science-fiction-planet.html



Kepler Object of Interest 5 (KOI-5) was one of the first batch of possible exoplanets sent down by the Kepler space telescope in 2009. But the first follow-up data quickly showed the system was complicated by an additional star and weird follow-up observations. Mission astronomers were gleefully (and perhaps slightly frantically) wading through possible exoplanet discoveries, so it was put aside and the data was left in the public archive. The same system was flagged again a decade later by TESS as a TESS Object of Interest (TOI-1241).

High-resolution imaging by one team of astronomers was combined with longer time baseline radial velocity data from another team and the story began to emerge: KOI-5 was a triple-star system with an exoplanet orbiting one of the stars. This discovery was presented at the January 2021 American Astronomical Society meeting, and a peer-reviewed paper is forthcoming.

Two sun-sized stars, designated A and B, orbit each other every 29 years in the middle of the system, while a third, smaller star orbits the two central stars every 400 years. The discovered planet is called KOI-5Ab, because it orbits star A, on an orbit that is tilted wildly away from the plane of the stars' orbits.

Data from Kepler and TESS, which required the effort of dozens of astronomers working together, has revealed the size of KOI-5Ab: seven times the radius of the Earth. Another team of astronomers used radial velocity data to measure the mass of KOI-5Ab: 57 times the mass of the Earth. Combining these numbers gives the density, and tells us this planet is a gas giant planet, a bit smaller and denser than Saturn.

Even in orbit over this planet, full darkness would only be available for brief snatches every couple hundred years when all three stars wandered into the same portion of the celestial sphere. This exoplanet system sounds like a science fiction story, but astronomers have been able to conclusively prove its existence.

See also: Nightfall by Isaac Asimov

https://en.m.wikipedia.org/wiki/Nightfall_(Asimov_novelette_and_novel)#Plot_summary
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Sigmetnow

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Re: Astronomical news
« Reply #544 on: March 27, 2021, 07:57:38 PM »
Metric Paper & Everything in the Universe
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Sigmetnow

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Re: Astronomical news
« Reply #545 on: March 27, 2021, 11:58:55 PM »
Quote
NASA @NASA 3/26/21, 1:59 PM
Calling all girl bosses

Join @WomenNASA on Monday, March 29 at 2:30pm ET for our #WomensHistoryMonth @reddit Ask Me Anything on reddit.com/r/IAmA to chat about space exploration, what it's like to work on cutting edge NASA missions & how to turn dreams into reality! 
https://twitter.com/nasa/status/1375507617846419459
Photo-gif at the link.
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vox_mundi

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Re: Astronomical news
« Reply #546 on: March 28, 2021, 03:49:43 AM »
New Theory Suggests Large Blobs of Material In Earth's Mantle Are Remnants of Protoplanet Theia
https://phys.org/news/2021-03-theory-large-blobs-material-earth.html



A team of scientists at Arizona State University has proposed that the large blobs of material in Earth's mantle (the large low-shear velocity provinces, LLSVPs) may be left over pieces of Theia, a protoplanet theorized to have struck Earth, resulting in the creation of the moon. The group argued their case at this year's Lunar and Planetary Science Conference and are awaiting publication in Geophysical Research Letters.

Most space scientists have come to believe that the moon was created when another planet (now called Theia) collided with a very early Earth—pieces of Earth, Theia or both that were flung into space during the collision eventually coalesced into the moon. Theories regarding what happened to the rest of Theia are still being argued. In this new effort, the team in Arizona suggests that much of Theia's mantle wound up in Earth's mantle, forming what are now called the large low-shear-velocity provinces, LLSVPs—one beneath parts of the African continent and one beneath the Pacific Ocean.

Scientists have been studying the LLSVPs for many years—their existence has been confirmed by studying seismic readings around the globe. When seismic waves run into the LLSVPs, they slow down, suggesting the material they are made of is denser than the rest of the mantle. The LLSVPs are very large and rest on the rim of the outer core. The team at ASU note that if Theia's mantle was denser than Earth's, any of it that made its way to the mantle would eventually work its way to the core.

To back up their ideas, the team at ASU built a model depicting Earth as it was approximately 4.5 billion years ago and then showing what could have happened if there were a collision with a planet the size of Mars, or even larger. The model also assumed that the mantle of the theorized planet Theia was rich in iron, making it extremely dense. In their model, Theia winds up mostly destroyed, with pieces flung into space to create the moon, and much of its mantle breaking into fragments, which make it all the way into Earth's mantle. Over billions of years, the fragments merge, forming the LLSVPs.

52nd Lunar and Planetary Science Conference 2021 (LPI Contrib. No. 2548)
https://www.hou.usra.edu/meetings/lpsc2021/pdf/1980.pdf
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Sigmetnow

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Re: Astronomical news
« Reply #547 on: March 28, 2021, 05:23:52 PM »
2,200 exoplanet candidates discovered in 2 years: TESS has been busy
Quote
Since completing its original two-year mission, TESS is now on an extended mission to discover more exoplanets and to uncover more details about those it has already found evidence for. It takes time and patience to confirm the existence of a candidate planet, and so far around 120 of the candidates discovered by TESS have been confirmed. ... 
https://www.digitaltrends.com/news/tess-2200-exoplanet-candidates/

—-
Hear Black Holes and Galaxies Sing in These Captivating NASA 'Sonifications'
https://singularityhub.com/2021/03/27/hear-black-holes-and-galaxies-sing-in-these-captivating-nasa-sonifications/
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Brigantine

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Re: Astronomical news
« Reply #548 on: March 30, 2021, 06:57:57 AM »
New Theory Suggests Large Blobs of Material In Earth's Mantle Are Remnants of Protoplanet Theia
https://phys.org/news/2021-03-theory-large-blobs-material-earth.html
Best bit about this, is it gives an explanation for why supercontinents break apart. The LLSVPs were there first, and the supercontinent accidentally wandered over the top of one of them, and rifting ensues.

Well, it's not actually discussed in the paper like that. But they do mention how volcanism clustering around the LLSVPs is different isotopically (He4/He3) from more distant lavas.

One of the LLSVPs is pretty much every place where other continents split off from Africa... interesting.
« Last Edit: March 30, 2021, 07:57:12 AM by Brigantine »

Sigmetnow

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Re: Astronomical news
« Reply #549 on: April 01, 2021, 02:27:13 AM »
Interstellar comet Borisov was a pristine example of material from another solar system
https://www.syfy.com/syfywire/the-interstellar-comet-borisov-was-shiny-and-new-when-it-passed-through-our-solar-system

Thoughtful thread about what the findings actually mean starts here:
Quote
Phil Plait
@BadAstronomer 3/31/21, 11:35 AM
The second interstellar object ever seen to pass through our neighborhood — comet Borisov — reveals its secret: It's a pristine, nearly untouched sample of an alien solar system. ...
https://twitter.com/badastronomer/status/1377283495085621255
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