- Alien Earths
 - Follow along on an extraordinary journey that may answer the age-old question of whether there is life elsewhere in the universe. Learn about planet and star formation, the search for extra-solar planets, and where life can exist elsewhere in the universe. - Are We Not the Only Earth Out There? - Howstuffworks
- In the relatively new science of planet hunting, no find is more prized than finding a planet like ours, one that could support life. Howstuffworks gives a brief over view of where other Earths might be found.
- CoRoT-7b, the Lava Planet - Sky & Telescope
- Kepler Mission (4)
- Sites about the proposed mission designed to discover and characterize hundreds of Earth-size planets using a spacebased photometer.
- Rocky Planet Search at Lick Observatory
- Endeavoring to answer the question: Do other Earth-like planets exist? Learn about the construction of the Automated Planet Finder telescope atop Mount Hamilton.
- Terrestrial Planet - Wikipedia
- Article about terrestrial planets. Also know as a telluric planet or rocky planet, a terrestrial planet is a planet that is primarily composed of silicate rocks, are the planets located closest to the Sun, and are in some way, "Earth-like".
- Terrestrial Planet Finder - JPL Planet Quest
- The Terrestrial Planet Finder observatories will study all aspects of planets outside our solar system: from their formation and development in disks of dust and gas around newly forming stars to their suitability as abodes for life.
- The Search for Another Earth - PlanetQuest
- Official NASA site for the PlanetQuest missions. Includes news of new planet discoveries, information on the latest extrasolar planet research, and a new worlds atlas.
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