Some of the content comes from my [[books]], including ''The Universal Book of Astronomy'', ''The Complete Book of Spaceflight'', ''The Extraterrestrial Encyclopedia'', and ''Life Everywhere: The Maverick Science of Astrobiology''. Other entries are unique to the on-line Encyclopedia and have, in some cases, been suggested or provided by outside parties. | Some of the content comes from my [[books]], including ''The Universal Book of Astronomy'', ''The Complete Book of Spaceflight'', ''The Extraterrestrial Encyclopedia'', and ''Life Everywhere: The Maverick Science of Astrobiology''. Other entries are unique to the on-line Encyclopedia and have, in some cases, been suggested or provided by outside parties. |