IPB

Welcome Guest ( Log In | Register )

5 Pages V  < 1 2 3 4 5 >  
Reply to this topicStart new topic
List of evidence for water on Mars
dolphin
post Sep 27 2015, 08:16 AM
Post #31


Junior Member
**

Group: Members
Posts: 23
Joined: 24-August 07
Member No.: 3405



QUOTE (nprev @ Sep 27 2015, 06:39 AM) *
If that has any validity it would probably be a reference to the slope streaks; not flowing open water, and very transient (whatever they actually turn out to be.).

However, as you said, it's just a rumor. Could be a few other things instead. We'll know on Monday.



I suppose if its briny water, you could see flows that are, as you say, transient. We'll find out soon enough.
Go to the top of the page
 
+Quote Post
drz1111
post Sep 28 2015, 03:15 PM
Post #32


Junior Member
**

Group: Members
Posts: 38
Joined: 14-August 12
Member No.: 6558



Just like the Atacama. Cool that it happens at that T+P.
Go to the top of the page
 
+Quote Post
dudley
post Sep 28 2015, 05:38 PM
Post #33


Junior Member
**

Group: Members
Posts: 68
Joined: 27-March 15
Member No.: 7426



Clear evidence of liquid water on Mars' surface has just been announced by NASA. It's believed that the water contains salts which lower its freeezing point, allowing it to remain liquid. Whether or not such brines could allow life to flourish is apparently a point of scientific contention. Link, below, to NASA release:
nasa confirms evidence that liquid water flows on today's mars
Go to the top of the page
 
+Quote Post
scalbers
post Sep 28 2015, 06:00 PM
Post #34


Senior Member
****

Group: Members
Posts: 1620
Joined: 5-March 05
From: Boulder, CO
Member No.: 184



The lowered melting point in the presence of perchlorates reminds me of the possible water drops seen from Phoenix.


--------------------
Steve [ my home page and planetary maps page ]
Go to the top of the page
 
+Quote Post
JRehling
post Sep 28 2015, 06:12 PM
Post #35


Senior Member
****

Group: Members
Posts: 2530
Joined: 20-April 05
Member No.: 321



Some rather acrobatic surface missions that we might want to pursue now are:

1) A lander/etc that could sit at the base (top?) of a promising slope and try to observe one of these events when it occurs.
2) A lander/rover/etc that could visit the surface precisely where one of these events had recently occurred.
2.1) A sample return of the above.

These are all rather challenging goals, but the interest will certainly be high.
Go to the top of the page
 
+Quote Post
Gsnorgathon
post Sep 28 2015, 06:48 PM
Post #36


Member
***

Group: Members
Posts: 259
Joined: 23-January 05
From: Seattle, WA
Member No.: 156



A loooong time ago I saw an item somewhere on the JPL site about a "mountaineer" mission. Basically two rovers, one of which would sit at the top of a slope and belay the other while it descended. I'd guess the proposal was first made in response to Mars Global Surveyor's initial reports of gullies.
Go to the top of the page
 
+Quote Post
dudley
post Sep 28 2015, 07:19 PM
Post #37


Junior Member
**

Group: Members
Posts: 68
Joined: 27-March 15
Member No.: 7426



There seems to be a good deal of concern that visiting sites with flowing water could contaminate them with organisms brought from Earth. Most Mars probes are apparently not fully sterilized. A 'clean' mission to an area with seasonally flowing water would be worth considering, of course.
Go to the top of the page
 
+Quote Post
marsophile
post Sep 28 2015, 07:39 PM
Post #38


Member
***

Group: Members
Posts: 507
Joined: 10-September 08
Member No.: 4338



In this morning's press conference on Recurrent Slope Lineae (RSL), they mentioned there are some candidate RSLs on Mount Sharp. In answer to a question, it was said that even though contact work might be precluded due to Planetary Protection considerations, it could be useful to observe the process from a distance on the ground.

{EDIT] Sorry, I meant to post this in the main section, not the route section. Moderator: could you please transfer it?

MOD- Done! smile.gif
Go to the top of the page
 
+Quote Post
ElkGroveDan
post Sep 28 2015, 08:06 PM
Post #39


Senior Member
****

Group: Admin
Posts: 4763
Joined: 15-March 05
From: Glendale, AZ
Member No.: 197



QUOTE
Ojha first noticed these puzzling features as a University of Arizona undergraduate student in 2010, using images from the MRO's High Resolution Imaging Science Experiment (HiRISE). HiRISE observations now have documented RSL at dozens of sites on Mars. The new study pairs HiRISE observations with mineral mapping by MRO’s Compact Reconnaissance Imaging Spectrometer for Mars (CRISM).


What is puzzling is that there is not even the slightest nod to MGS which identified these kinds of features a decade earlier. (admittedly I've only read the copy that has been released on this and didn't listen in to nay banter during the press conference.)


--------------------
If Occam had heard my theory, things would be very different now.
Go to the top of the page
 
+Quote Post
Steve G
post Sep 28 2015, 08:17 PM
Post #40


Member
***

Group: Members
Posts: 289
Joined: 29-December 05
From: Ottawa, ON
Member No.: 624



Will someone please correct me if I am wrong. Either I am psychic or they've already shown pictures of these water trails a long time ago. When I saw this on the news I was scratching my head, thinking, this is old news.
Go to the top of the page
 
+Quote Post
elakdawalla
post Sep 28 2015, 08:18 PM
Post #41


Administrator
****

Group: Admin
Posts: 5172
Joined: 4-August 05
From: Pasadena, CA, USA, Earth
Member No.: 454



MGS found slope streaks; recurring slope lineae aren't the same thing, they occur at a much smaller scale. People are pretty confident that slope streaks arise from an entirely dry process.


--------------------
My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
Go to the top of the page
 
+Quote Post
stevesliva
post Sep 28 2015, 08:50 PM
Post #42


Senior Member
****

Group: Members
Posts: 1576
Joined: 14-October 05
From: Vermont
Member No.: 530



QUOTE (Gsnorgathon @ Sep 28 2015, 01:48 PM) *
A loooong time ago I saw an item somewhere on the JPL site about a "mountaineer" mission. Basically two rovers, one of which would sit at the top of a slope and belay the other while it descended. I'd guess the proposal was first made in response to Mars Global Surveyor's initial reports of gullies.


There was a proposal to belay into the Valles Marineris to examine the strata. I think the geological interest shifted elsewhere.
Go to the top of the page
 
+Quote Post
gpurcell
post Sep 28 2015, 09:31 PM
Post #43


Member
***

Group: Members
Posts: 242
Joined: 21-December 04
Member No.: 127



Seems to me a reasonably priced approach could be a stationary mission on a flat area below one of these sites. Have a fixed super wide angle camera and the biggest telephoto lens possible on a fast rotation mount. Have the onboard computer continually monitor the fixed camera and slew the telephoto lens to any location that shows signs of movement. Also have some really precise environmental sensors to see what is correlated with the discharges.
Go to the top of the page
 
+Quote Post
atomoid
post Sep 28 2015, 10:19 PM
Post #44


Member
***

Group: Members
Posts: 866
Joined: 15-March 05
From: Santa Cruz, CA
Member No.: 196



I was also confused about the RSL vs 'slope streaks' (vs gullies for that matter) and it seems the slope streaks are the big dust avalanches, more info is in this space.com article.

The small RSL is postulated to be brine flowing just under the surface, actually 'wetting' the top layer of soil. I'm not sure how they rule out the possibility that RSL are also avalanches of a sort that are merely exposing the darker salty subsoil underneath a dusty top layer, as can be inferred from how perchlorates are suspected to be formed (Science Times article Arizona Dave shared in this post)
Go to the top of the page
 
+Quote Post
dolphin
post Sep 28 2015, 10:22 PM
Post #45


Junior Member
**

Group: Members
Posts: 23
Joined: 24-August 07
Member No.: 3405



Am I missing something? Why would briny perchlorate heavy "liquid water" be seen as remotely habitable for life or even resource mining? As to the latter, we know there is water ice trapped in the caps.

Also, this discovery has been known/suspected for 2 years now:

http://www.extremetech.com/extreme/172937-...-contaminate-it
Go to the top of the page
 
+Quote Post

5 Pages V  < 1 2 3 4 5 >
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 19th March 2024 - 03:10 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and 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.