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Possibility of Life On Mars Looking More Remote
Riding with Robots writes "The never-say-die robotic geologist Opportunity continues its extended explorations in Victoria Crater on Mars. The latest findings from the mission suggest that while plenty of water did exist in this location, it was so salty that life would have a very hard time gaining a foothold. 'Not all water is fit to drink,' said Andrew Knoll, a member of the rover science team. 'At first, we focused on acidity, because the environment would have been very acidic. Now, we also appreciate the high salinity of the water when it left behind the minerals Opportunity found. This tightens the noose on the possibility of life.'"
There are animals on Earth that live in environments with higher pressure.
http://en.wikipedia.org/wiki/Deep_sea_fish
Let's not forget the most unlikely place where we've found life: the human stomach. It was assumed for over a century that the stomach was just too acidic for microbial life.. then some Australian medical researchers claimed to have discovered microbes that live in the stomach and were literally laughed at for decades before they managed to culture them. Robin Warren and Barry Marshall won the Nobel prize for medicine in 2005 after showing the bacterium Helicobacter pylori plays a key role in the development of both stomach and intestinal ulcers.
How we know is more important than what we know.
Mars is a big ball of dust with little atmosphere, no magnetosphere, no water...
Please stop already with displaying your abysmal ignorance. Mars has the largest (though now exinct) volcano in the solar system (Olympus Mons, along with three nearly as big on Tharsis). You don't get those on a "ball of dust". Sure, there may not be much magnetosphere at the moment -- Earth has had periods like that too, during geomagnetic reversals. There's still life here.
As for water...if you don't believe the photographs, go get yourself a decent telescope and just take a look at Mars. See that white patch at the pole? That's ice, also known as frozen water. (Yeah, the winter icecap also gets some CO2 ice; the permanent cap is water ice.)
Perhaps Mars never did have life. But your analogy is like the guy who goes looking for his dropped keys under the lamppost because the light there is better than where he dropped them. We haven't begun to look in the really interesting places yet.
-- Alastair
glad you brought that up, there are organisms on earth that can survive hellish conditions and in fact are thought to have existed on early earth. extreme saltiness, acidity, cold, heat, pressure, radiation etc... we have organisms living happily in all of them. there's bacteria that survived being autoclaved, found in acids nearly 0 in ph, radiation levels 3,000 times what it would take to kill humans and microbes that survived being frozen in ice for 8 million years. life can be pretty stubborn and frankly, I wouldn't count life on Mars as an impossibility even today as microbes have been found over a kilometer underground.
Sigs are too short to say anything truly profound so read the above post instead.
It seems that NASA is well aware of extremophiles, but even considering the range of environments that support life here, there's still a limit. There is no life on Earth that exists without water, nor is there an alternative solvent available on Mars. There is no life on Earth that exists outside of a relatively tight temperature band (as far as the cosmos go, -50 C to 150 C is pretty narrow). There is no life on Earth that is able to survive a temperature swing of more than 100 C. Etc.
Maybe there's silicon-based life somewhere in the cosmos, but the chemical reactions that are required to sustain carbon-based life have certain limits. Temperature, pressure, the availability of certain minerals and the availability of water are chief among them.
When has that stopped us before?
WWJD.... for a Klondike bar?
... but the pressure on Mars is about 6 millibars, or six one-thousandths of the air pressure on Earth. High pressure is not exactly an issue.
David Bowie lyrics from the early 70s: "It's on America's tortured brow That Mickey Mouse has grown up a cow. ....
Oh man! Wonder if he'll ever know
He's in the best selling show
Is there life on Mars?"
Saddle up: Riding with Robots
Mars has the largest (though now exinct) volcano in the solar system. You don't get those on a "ball of dust".
But that volcano may have been extinct for 2 billion years or so.
Sure, there may not be much magnetosphere at the moment -- Earth has had periods like that too, during geomagnetic reversals. There's still life here.
Earth's reversals do *not* stop our magnetosphere, just make it a bunch of mini-magnetospheres for a while. They are not as strong as the normal ones, but they do the job.
Table-ized A.I.