The Moon! The distance from the center of the Earth to the center of the Moon is 238,857 miles.
Venus and Mars are quite similar to Earth. In terms of size, average density, mass, and surface gravity, Venus is significantly similar to Earth. Mars, on the other hand, have days that are just over 24 hours which is quite similar to the length of days that Earth has. Its rotation axis is tilted by about the same amount as Earth’s. It is also thought that at some point in Mars’s past, it may have had liquid water on its surface, just as Earth does now. This leads some people to suspect that life had once existed in Mars.
However, recent studies show that there are two other planets found to be quite similar to Earth. Gliese 581 and Gliese 581 d are two exoplanets likely to have oceans just like Earth.
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