Redirected from Terrestrial planets
Earth's solar system has four terrestrial planets: Mercury, Venus, Earth and Mars. At one time there were probably many more terrestrials, but most have been ejected from the solar system or otherwise destroyed. Only one terrestrial planet, Earth, is known to have an active hydrosphere.
NASA is considering a proposed project called the Terrestrial Planet Finder, which will be capable of detecting terrestrial planets in other solar systems. All currently-known extrasolar planets are extremely large, and are most likely to be gas giants.
See also:
wikipedia.org dumped 2003-03-17 with terodump