It’s arguably the most scrutinised piece of rock ever. Now an even closer look at a meteorite from Mars suggests it may show signs of life after all. …
One area of disagreement centred around nanocrystal magnetites in the rock, some of which appear to have chemical and physical features identical to those produced by contemporary bacteria. Sceptics of the biological explanation suggested that the magnetites were created when carbonate decomposed under high pressures and temperatures, …
Now a fresh analysis by McKay and colleagues rules out the carbonate decomposition explanation. … The possibility that the rock contains fossilised microbes received another boost in August when a team … showed that carbon in the meteorite was deposited in balmy water conducive to life.
Of course this doesn’t directly confirm longer distance panspermia.
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retired phlebotomist 
Granite26 
[...] and so meteorites from comets would be the most likely place to find alien life fossils. We also seem to see alien life fossils from Mars. Furthermore, the only known betting market on this topic has [...]
By Overcoming Bias : Alien Life Info, But Not Status, Found March 6, 2011 at 10:16 am