PhET 614 

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course Phy 121

7/23 around 4:22

As the distance between the sun and the earth decreases the earth takes less time to make a complete revolution and the gravitational forces vary slightly.If the moon is moved far enough away from the earth it will begin orbiting the sun rather than the earth.

If the space station is moved too close to earth is will collide and if it is too far away it will no longer orbit earth.

Without gravity there would be no way for any object to orbit another.

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Good. Thanks.

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