Science

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 overview and technical papers.

Short scientific article by John R. Gribbin. "Spreading of life-bearing spores across the Galaxy (panspermia) may be easier than is usually acknowledged."

Descriptive entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight.