CptStern
suckmonkey
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According to one theory, impacts on the surface of the Red Planet could have thrown Martian rocks into space, which wandered the vaccum before tumbling through Earth's atmosphere and crashing down as meteorites.
If these Martian meteorites contained any life forms able to survive the journey, they might have been able to gain a foothold on our own planet, scientists speculate.
The best-studied radiation-resistant microbe is Deinococcus radiodurans.
It can withstand several thousand times the lethal dose of radiation for humans, and has been nicknamed "Conan the bacterium" by microbiologists.
"Our hypothesis of a Martian origin for radio-resistant bacteria provides an explanation for their ability to withstand ionizing radiation, a trait that appears to be of no value on Earth at any time in its history,"
pretty awesome
http://news.bbc.co.uk/2/hi/science/nature/6191197.stm