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Without the moon, there would be no life on Earth. Moon keeps Earth stable on our axis, otherwise the Earth would wobble uncontrollably leading to unpredictable conditions and climates anywhere. The Sahara desert could be the next tundra, etc. Obviously, without the Earth, the moon wouldn't be here either. Moon is very important. Its the reason for consistent days and season changes.

A:

The Earth and Moon are gravitationally bound to each other: so much so, that the Moon doesn't actually orbit the Earth. Instead, the Earth and Moon orbit each other about their center of mutual gravity, called a barycenter: a virtual point currently about 1,000 miles down (inside the Earth's mantle). In fact, as the Moon moves further away from the earth, that center of gravity is literally inching closer to the Earth's surface, at an average rate of about one inch per year.

In fact, in about 5 billion years or so (about the time the sun is expected to turn into a red giant) the barycenter of the Earth-Moon system will break the Earth's surface and rise into the open. At that time, the Earth and Moon will officially be reclassified as a double planet, rather than a planet and satellite... if, of course, there's still anyone around by then to do so.

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