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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

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 #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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