Re: Wut?
Wed Sep 30, 2015 7:54pm

Tim, once again you are exaggerating. In fact, the science team admits that they have yet to determine the source of the liquid water that they believe caused the streaks. Though subsurface sources are a possibility, it could also be deliquescence.

In fact, they haven't even actually detected liquid water. They detected "signatures of hydrated salts" they believe formed in the presence of ephemeral amounts of liquid water. There is not "widespread subsurface [liquid] water." There is subsurface ice that, in some rare locations on Mars, in the presence of salts, may seasonally soften, melt and wick to the surface. That's an exciting discovery, but it's not about "widespread subsurface [liquid] water."

"What we're dealing with is wet soil, thin layers of wet soil, not standing water," McEwen said today during a NASA press conference about the new discovery."

"But the new results don't imply that life thrives on Mars today, or even that this is a likely proposition," Ojha stressed. "Perchlorate brines have a very low "water activity," he said, meaning that the water within them is not easily available for potential use by organisms."

"If RSL are perchlorate-saturated brines, then life as we know [it] on Earth could not survive in such low water activity," Ojha said..

Yes, this is a terrific discovery. For the first time in the history of our exploration of Mars we have substantive evidence for the ephemeral presence of liquid water. However, the fact that it's taken this long and been this difficult tells us a story of how utterly dry Mars truly is.

Moreover, data from CRISM tells us that if these RSLs are actually the result of small amounts of liquid water, it's essentially completely evaporated and bone dry by the late Martian afternoon:

"Hydrated salts precipitate from liquid water, so detecting them is a big deal especially since circumstances make it unlikely that CRISM could spot RSL water directly. CRISM observes the Red Planet at the driest time of the Martian day, about 3 p.m., when any liquid surface water would likely have evaporated," Ojha said.

"Due to that, I do not think we will ever find the RSL still in their liquid form at 3:00 p.m., so I think this hydrated signature of the salts is definitely a 'smoking gun,'" he said.

Instead of making stuff up Tim, maybe you should actually read the story.

  • Wut?tbeech, Tue Sep 29 4:29pm
    Maybe you should watch the press conference before you comment about what they were speaking of. Nothing you wrote even comes close to the topic of discussion, which was widespread subsurface water.... more
    • Re: Wut? — algorithms, Wed Sep 30 7:54pm
      • The hair you split Jim, Thu Oct 1 3:02am
        could be you're own. Then you admit too Mars having a relative humidity > 50% = ?
        • You can lead a horse to watertbeech, Thu Oct 1 1:21pm
          But you can't make him drink statically charged soil.
          • but you can't make him drink the bone dry dustalgorithms, Thu Oct 1 8:52pm
            Just keeping you honest Tim. It's great that we finally found evidence that suggests the intermittent and ephemeral presence of liquid water in rare locations on Mars. But the amount of liquid water... more
            • The worm has turnedtbeech, Fri Oct 2 7:03am
              Occam's razor tells us this is mud. Common sense tells us this is life. NASA tells us this is possible.
              • Occam's Razoralgorithms, Fri Oct 2 4:31pm
                Once again, Mr. Beech, Occam's Razor leads me to conclude that you are off your rocker and not playing with a full deck.
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