MSL "Drive, drive, drive" toward Glenelg, The scientists (mostly) get the keys - sols 38-56 |
MSL "Drive, drive, drive" toward Glenelg, The scientists (mostly) get the keys - sols 38-56 |
Oct 3 2012, 11:46 AM
Post
#451
|
|
Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Rivers flowed on Mars, so it would be warm enough for rain.
Maven is going to provide answers to how quickly the atmosphere escaped, should it sucessfully get into orbit. |
|
|
Oct 3 2012, 03:28 PM
Post
#452
|
|
Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Rivers flowed on Mars, so it would be warm enough for rain. Maven is going to provide answers to how quickly the atmosphere escaped, should it sucessfully get into orbit. Oh yes in the far past, rain might very well have fallen. If it came from volcanic eruption steam, chock melted ice (from same eruptions) or perhaps even a hydrological cycle in the first 100MY we don't know and there's still disagreement in the hypothesizes. But rain and more likely snow is far from ruled out, quite the contrary that idea is quite mainstream, the only question when it happened - see below. Rain: Science Daily And rain: Marsdaily There were some more paper also, with a claim that they actually seen one area that appeared to have been altered by rainfall. Couldn't locate that one offhand right now though. |
|
|
Oct 3 2012, 03:46 PM
Post
#453
|
|
Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
If you want to know what scientists think about rain on Mars, use the ADS Abstract Service to search. Only a few publications show up when you use "mars" and "rain" as search terms, so it helps to think: what polysyllabic word would scientists use instead of a simple term like 'rain'? Put in "mars" and "precipitation" and you'll get a lot more results.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
Oct 3 2012, 05:47 PM
Post
#454
|
|
Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
... But rain and more likely snow is far from ruled out .... Was I dreaming or one of the Phoenix press releases mentioned that it had observed water-based snow fall? I don't remember the details but I thoght I read something to that extent. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
|
|
|
Oct 3 2012, 05:50 PM
Post
#455
|
|
Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
I think you are referring to this http://www.nasa.gov/mission_pages/phoenix/...x-20080929.html and this http://www.nasa.gov/mission_pages/phoenix/...aks_SD_001.html
|
|
|
Oct 3 2012, 06:16 PM
Post
#456
|
|
Junior Member Group: Members Posts: 30 Joined: 7-March 04 Member No.: 51 |
Was I dreaming or one of the Phoenix press releases mentioned that it had observed water-based snow fall? I don't remember the details but I thoght I read something to that extent. Paolo MOLA evidently detected CO2 snow - 2nd figure at http://mola.gsfc.nasa.gov/clouds.html |
|
|
Oct 3 2012, 06:26 PM
Post
#457
|
||
Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Some days ago, looking to Sol54 MAHLI images, I realized that B/W pictures are "elevation maps" (or "Height Field") showing distance from the subject in the corresponding color picture using the gray scale (I would like to know how they extracted such info!).
So I used PovRay in order to represent such data in a 3D rendering (I had to smooth/interpolate original height map due to poor number of levels used): http://youtu.be/2PbJiqWLTbM This is a crossed-eyes stereogram based on two frames of the movie: -------------------- I always think before posting! - Marco -
|
|
|
||
Oct 3 2012, 06:27 PM
Post
#458
|
|
Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Was I dreaming or one of the Phoenix press releases mentioned that it had observed water-based snow fall? I don't remember the details but I thoght I read something to that extent. Paolo Snow, yes snowfall, yet without reaching the surface still why the 'more likely' on that one. One of the Viking landers snapped one image of frost then back to Phoenix what was seen on one of the legs might have been hoarfrost. And yes as Pete B said, CO2 snow at the south pole. |
|
|
Oct 3 2012, 06:53 PM
Post
#459
|
|
Member Group: Members Posts: 150 Joined: 3-June 08 From: McLean, VA Member No.: 4177 |
...So I used PovRay in order to represent such data in a 3D rendering...: http://youtu.be/2PbJiqWLTbM ... That's really cool! |
|
|
Oct 3 2012, 07:02 PM
Post
#460
|
|
Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
Some days ago, looking to Sol54 MAHLI images, I realized that B/W pictures are "elevation maps" (or "Height Field") And then, this like some kind of divine revelation. Thanks for pointing this. From my point of view I tought it was some sort of mask, or something. But now, it makes sense . -------------------- |
|
|
Guest_Actionman_* |
Oct 3 2012, 07:39 PM
Post
#461
|
Guests |
At a point some time back, years, Michael Malin stated, in unequivocal terms about white in a photo was to be snowfall, water snow. The photo being of a non-polar region.
As white as CO2 can only be maintained at the poles. |
|
|
Oct 3 2012, 08:03 PM
Post
#462
|
|
Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
I think you are referring to this http://www.nasa.gov/mission_pages/phoenix/...x-20080929.html and this http://www.nasa.gov/mission_pages/phoenix/...aks_SD_001.html Thanks. That was it. Good to know I was not dreaming. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
|
|
|
Oct 4 2012, 05:15 AM
Post
#463
|
|
Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
And then, this like some kind of divine revelation. It was, indeed! Here below another processed shot from same sequence: http://youtu.be/HnvY5k9sABQ -------------------- I always think before posting! - Marco -
|
|
|
Oct 4 2012, 09:48 AM
Post
#464
|
|
Member Group: Members Posts: 153 Joined: 4-May 11 From: Pardubice, CZ Member No.: 5979 |
Some days ago, looking to Sol54 MAHLI images, I realized that B/W pictures are "elevation maps" (or "Height Field") showing distance from the subject in the corresponding color picture using the gray scale (I would like to know how they extracted such info!). From MAHLI instrument description @ MSSS: "• MAHLI can acquire multiple images of the same feature at different focus positions and use this to build a best-focus image and a range map of the target. This process is sometimes called z-stacking or focal plane merging." |
|
|
Oct 4 2012, 08:06 PM
Post
#465
|
|
Junior Member Group: Members Posts: 85 Joined: 5-September 12 Member No.: 6635 |
Reading through some of these discussions here and elsewhere I'm reminded of a quote
" Mars is not Earthlike. Mars is Marslike" By who I can't remember. |
|
|
Lo-Fi Version | Time is now: 25th April 2024 - 08:48 PM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |