High Resolution Astronomy Our Faithful Companion Faux Canvas Print
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The Moon, Earth's only natural satellite, orbits 30 times Earth's diameter away. Its rotation is locked to Earth due to gravitational pull, resulting in the same side always facing Earth. The Moon is a planetary-mass object, with a surface gravity one sixth of Earth's. It formed 4.51 billion years ago from debris of a giant impact between Earth and a Mars-sized body, Theia. The lunar surface is marked by mountains, craters, and dark plains of cooled magma.
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