Phoenix Mars Lander Deploys Robotic Arm, Possibly Finds Ice

The Phoenix Mars Lander has successfully deployed its robotic arm and tested other instruments including a laser designed to detect dust, clouds, and fog. The arm will be used to dig up samples of the Martian surface, which will be analyzed as a possible habitat for life. A camera on the arm will allow pictures to be taken of the ground directly beneath the lander. The camera has already seen what may be ice, which was exposed when the soil was disturbed by the landing. The data collected by the arm will be compared to recent findings which suggest that water on Mars may have been too salty for most known forms of life.

Comments

Extremophiles

[Gothmolly]

Just because its too salty for 'most' life doesn't mean its too salty for ANY life.

Re:Extremophiles

[v1]

We keep seeing these same generalizations going on when looking for life elsewhere.

Lets face it, odds are if we DO find life, it's going to be fundamentally different than what we're expecting it to be. Saying conditions aren't good for life anywhere based on what we consider habitable is silly. The reason our conditions are ideal for our life isn't because we got lucky and got the right combination of environment to grow up in, it's because we adapted to become the best suited for the environment we developed in.

I'll give them "initial conditions" though. Certain environments certainly lower the odds for genesis. Once you've achieved genesis however, evolution takes over, and so long as you don't have a fast severe change in conditions, life will adapt over time to become well-suited to whatever the environment can throw at it.

So unless you're looking for life that has just recently come to be, there's almost no point in examining conditions. Probably the only environmental necessity is reasonable temperatures. (and I mean very generous range, at least a ways over abs 0 and too low to melt lead)

Actually, on the high end, it would not completely surprise me to find life IN a sun. Whenever we look somewhere and say no life can exist there, it's too hot, too cold, too alkaline, too dry, whatever, we end up finding life. Recently we found life IN a rock, eating radioactivity. After that you pretty much have to be an optimist.

Re:Extremophiles

[jd]

You are correct. Although it has been pointed out by others that terrestrial lifeforms that handle extreme salinity first evolved in purer waters, this doesn't tell us a whole lot, as water at extreme depths may well be extremely pure, with life migrating towards the surface as it became more tolerent of conditions. Also, knowing it was salty at one point in time does not tell us about salt levels prior to this, or indeed about salt levels anywhere on Mars outside of the points so far examined. All this also assumes a traditional carbon-based lifeform, which although the most likely, is not guaranteed to be the only form of life. Silicon is a strong contender, particularly if you have environments in which carbon-based structures would be less likely to survive.

In short, we could easily dream up a million and one scenarios in which life could have existed on Mars or could exist there today. Without more information, all we can say with any certainty is that terrestrial life could not have arisen on the surface of Mars within the narrow region of space and time for which we have reliable geological data. We can say nothing about any other form of life, any other location on Mars, or any other point in Martian history.

(God, I hate agreeing with someone who's got me marked as a foe. It's so... so... Un-Slashdotish, somehow.)

Re:Extremophiles

[symbolset]

Based on what we know about Earth, they say that it's difficult to imagine life arising in acidic, oxidizing brines like those inferred for ancient Mars.

er, ahem --

Hamlet:

And therefore as a stranger give it welcome.

There are more things in heaven and earth, Horatio,

Than are dreamt of in your philosophy.

Hamlet Act 1, scene 5, 159-167

Wm. Shakespeare

Two billion years from now it may be difficult to imagine life evolving on the Earth. If you can still find the Earth, that is. Time has a way of hiding things.

Re:Extremophiles

[maxume]

What are you expecting life elsewhere to be? I'm expecting it to be something that takes advantage of energy gradients (food is essentially an energy gradient, it takes less energy to gather fruit than the fruit contains, similarly for prey) in order to maintain its own order at a level above that of the average environment that it exists in.

Re:Finally a solution for glbal warming

[NMerriam]

United States is going to send shipments of ice from Mars to cool the warming caused by its gas guzzlers

Somehow I doubt importing billions of tons of frozen CO2 is going to help us reduce greenhouse gasses :)

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[account_deleted]

Comment removed based on user account deletion

Re:Lets get our priorities straight!

[foniksonik]

If attitudes like yours were more prevalent during the rest of human history we wouldn't have any of these problems... and we may never have gotten out of our caves... progress needs risk takers even if the risk is only that we are using resources to explore something rather than ensuring the security of what we already have... don't be such a luddite.

Might have found ice?

[exp(pi*sqrt(163))]

Before the lander even took off, we all knew it might find ice. Now it's landed there's a press release saying it might have found ice. Is there any news content here? Maybe what's different is that previously we knew it might have found something that might be ice, but now it's definitely found something that might be ice. But previously we also knew it might have found something that was definitely ice. Might be definitely, definitely might be? Please, someone wake me when it's definitely definite.

Re:Lets get our priorities straight!

[Brett Buck]

"A lot of *people pretending to be intelligent* believe that humanity + earth is a lot cause. "

        There, fixed that for you!

          Brett