Asteroid sites hint at life on Mars

Apr 16, 2012
Mars

(Phys.org) -- Craters made by asteroid impacts may be the best place to look for signs of life on other planets, a study suggests.

Tiny organisms have been discovered thriving deep underneath a site in the US where an asteroid crashed some 35 million years ago.

Scientists believe that the organisms are evidence that such craters provide refuge for microbes, sheltering them from the effects of the changing seasons and events such as global warming or ice ages.

The study suggests that crater sites on Mars may also be hiding life, and that drilling beneath them could lead to evidence of similar life forms.

Researchers from the University of Edinburgh drilled almost 2km below one of the largest craters on Earth, in Chesapeake, US.

Samples from below ground showed that microbes are unevenly spread throughout the rock, suggesting that the environment is continuing to settle 35 million years after impact.

Scientists say that heat from the impact of an would kill everything at the surface.

However, fractures to rocks deep below would enable water and nutrients to flow in and support life.

Some organisms grow by absorbing elements such as iron from rock.

The research was published in the journal Astrobiology.

The deeply fractured areas around impact craters can provide a safe haven in which can flourish for long periods of time. Our findings suggest that the subsurface of craters on Mars might be a promising place to search for evidence of life," said Professor Charles Cockell, School of Physics and Astronomy.

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Graeme
not rated yet Apr 16, 2012
What has this to do with Mars? A misleading headline and image!
Shootist
not rated yet Apr 16, 2012
Two articles for the price of one? Edinburgh provided the science and Phys.org, the speculation.