Netyaroze on 28 March 2012
To the bolded part in the OP.
Bacteria most probably dont evolve on comets. Scientists are talking about the building blocks of life (aminoacids) not whole finished bacteria but organic compounds.
@deadnotsleeping
The whole thing with arsenic instead of phosphorus using bacteria is fact. This was discovered by nasa scientists last year I think. And ofcourse proven.
