| le.ac.uk | International Organisations for Archaeoastronomy and Cultural Astronomy |
| nasa.gov | Nasa - Downloads |
| resa.net | Life Extraterrestrial: Life on Other Planets in the Solar System |
| occultations.org | International Occultation Timing Association (IOTA) |
| nss.org | National Space Society |
| jrmooneyham.com | The Rise and Fall of Star Faring Civilizations in Our Own Galaxy |
| iau.org | The International Astronomical Union (IAU) |
| berkeley.edu | Seti@home: Search For Extraterrestrial Intelligence At Home |
| jst.go.jp | Search for ET! |
| iap.fr | European Astronomical Society (EAS) |
| berkeley.edu | setiathome.berkeley.edu/ |
30208