The encyclopedia of astrobiology, astronomy, and spaceflight

The Encyclopedia is an on-line A-Z maintained by astronomer/author David Darling. The goal is to provide a comprehensive source of information covering contemporary astronomy, astrobiology, and astrophysics, SETI, space missions, advanced propulsion concepts, historical aspects, and biographies (past and present). It is intended to be of use to the interested layperson, student, and academic alike.