Craters on Earth made by asteroid impacts may provide clues in search for life on other planets, scientists have suggested.
They made the conclusion after researchers from the University of Edinburgh discovered tiny organisms 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.
The University of Edinburgh researchers drilled almost 2km below one of the largest asteroid impact 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 asteroid collision would kill everything at the surface, but 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 deeply fractured areas around impact craters can provide a safe haven in which microbes 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, of the University of Edinburgh’s School of Physics and Astronomy.
The research was published in the journal Astrobiology.