Cosmic Ancestry: The Modern Version of Panspermia The Cosmic Ancestry hypothesis - about which this site has a large amount of information - treats all of evolution, not just the origin of life on Earth, as due to interaction with cosmic microorganisms.
Panspermia Descriptive entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight.
Panspermia Revisited Short scientific article by John R. Gribbin. "Spreading of life-bearing spores across the Galaxy (panspermia) may be easier than is usually acknowledged."
