Emmanuel Davoust

Are comets, meteorites, and dust the stuff of life on Earth? Did life appear just once in 5 billion years? Or did it follow some principle of evolution and appear at several distinct periods, raising the possibility that life can exist elsewhere in the universe? Emmanuel Davoust, an internationally known specialist on galaxies, explores these provocative questions as well as such major themes and topics of debate as prebiotic chemistry and paleovisits, in this lucid investigation of the continuing search for extraterrestrial life.