Here is an interesting, but small, article:
http://www.newscientist.com/article/...materials.html
The thing I don't understand is how these chemicals may survive (as from as far as i know, amino acids etc are quite sensitive to condition change- please correct me if I'm wrong) upon an impact with the Earth on the asteroid. I would've thought that these building blocks of life may be 'obliterated' so to speak upon impact with the Earth's surface. So, would anyone care to explain? I'd love to know about this sort of thing, thanks!
By the way, I wasn't sure whether to post this in this sub-forum or biology...