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Write a note on Moon .
All planets, except for Mercury and Venus, have moons. Like the planets themselves, the moons are very unique objects. Our moon—the Moon—is similar to the terrestrial planets in composition and structure.Its diameter is about one-fourth of the diameter of the Earth. It has no atmosphere and its surface is heavily cratered by meteoroid impacts, like the surface of Mercury. The Moon is thought to have formed when a Mars-sized object smashed into the forming Earth billions of years ago. Material was blasted into orbit around Earth by this collision, and later pulled together by gravity to become the Moon. The Moon is the only celestial body to have been visited by humans (instead of just by robotic spacecraft).


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