The Earth is one of the solar system eight planets, according to from the sun by the near and distant are the third order, is located after Mercury and Venus; at eight major planets are ranked fifth in size. The Earth is the only one not from Greek or Roman mythology are by name. Earth word from Old English and Germanic. Here, of course, have much in other languages named. In Roman mythology, the earth goddess called Tellus, the Earth on behalf of the Roman earth goddess tellus. The Earth is the only one known to exist life planet.