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Why Doesn't the Moon Fall Down?

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Uploaded by on Nov 27, 2006

This 'Ask an Astronomer' episode explains how orbits work.

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Education

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Standard YouTube License

  • likes, 17 dislikes

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Uploader Comments (SpitzerJim)

  • looped

  • You try getting good audio on the side of a telescope dome on top of a mountain! ;p

  • im not sure if this is true but a really long time ago earth had shorter days(less than 24hrs) this is beacause the moon was closer to the earth(this meant the moon orbited earth way faster) if the moon kept going farther away from the earth is it possible that earth can have longer days and that the mon can break out of earth's pulling gravity?

  • Yes, current models lead us to believe that the Moon has slowed Earth's rotation, and will continue to do so. But the Sun will expand to a red giant and envelop the Earth and Moon long before the Moon breaks completely free of Earth's gravity.

Top Comments

  • every sun eclips the sun gets less covered by the moon. this shows the moon is moving away from the earth. i cant explain but it is true.

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  • I wonder what would happen if Earth were to escape Sun's gravity or fall to it. Imagine Earth accelerating!!! The whole earth would become like a fighter jet. Everyone on earth would feel a lot of G's lol. I wonder how that would feel?

  • ....yah.

  • sorry lady, your wrong

  • The moon is an space ship... i dont Know but i prefer to believe in that.

  • When I heard that I was like "What?"

  • apparently the moon is moving away from the earth at a rate of about 3.8 centimeters per year

  • Accurate to the first part. But if the moon were going slower or faster, it would simply take an elliptical orbit rather than circular. You'd really have to slow it down a hell of a lot before its path came near enough to the earth for the moon to collide with it.

  • its 11km/h going up so that gravity doesnt pull it back down i think

  • we already do. we use planets like mars and jupiter to get space craft to gain speed when traveling to the outer solar system

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