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The Moon is about 3474 kilometers in diameter and orbits the
Earth at a distance of about 384,000 kilometers. Our
world’s only companion, the Moon is believed to have been
created when a large, Mars-sized planet collided with the
Earth about 4.5 billion years ago, forming from the material
blasted away by the impact. The many craters visible on the
Moon’s surface were formed by asteroid impacts that mostly
occurred three billion or more years ago. |
