A very short one now to make up for the previous two. I've just been reading a short report in New Scientist that links to several other articles. Apparently new research has given added support to the hypothesis that the unusual features in the ALH 84001 meteorite (composed of Martian rock) are best explained as fossil micro-organisms. The alternative that they are of non-biological origin has been weakened by much study and now appears unlikely. It could also be that they are due to contamination by terrestrial microbes, but the features in question do not resemble any known variety of earth microbe. Whatever the case turns out to be, it is extremely interesting.
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Edit:
The Times have picked up the story.
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