The Moon(or Luna) is Earth’s only natural satellite. It was created as a result of collision between Earth and Mars-sized protoplanet Teia 4.53 billion years ago. It’s 384399 km away from Earth and moves away from our planet at a rate of 3.8 cm per year. The Moon’s gravity is 1/6 of Earth’s and it has no atmosphere. In 2009 NASA announced that they have found water on the moon. The Moon’s cycle is 29 days, 12 hours, 44 minutes. It is the only celestial body beyond Earth—so far—visited by human beings.