Exogenesis

The Book of Exogenesis: In the beginning was the word, and the word was a meteorite... Earlier this month, a report, based on NASA studies of meteorites found on Earth, suggested that some building blocks of DNA may have been formed in space. As it turns out, DNA components have been found on meteorites before, but it's never been entirely clear if the space rocks came to Earth bearing these molecules, or if they were contaminated upon arrival. Furthermore, this recent study of meteorites was the first to discover trace amounts of three molecules -- purine, 2,6-diaminopurine, and 6,8-…