Gravity Review
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In the final level in Newton's cannon game. You needed to fire cannonballs into orbit to defend the Earth. They needed to fired at the right angle and power to end up in orbit, or they would go into space or crash into Earth. With just the right force, they would end up in an elliptical orbit around Earth.
Challenge
Why do objects (such as cannonballs) end up in orbit around the Earth?
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