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Gravity's role is to keep the planets in orbit and balance.
Gravity holds us firmly on the ground and keeps the earth circling the sun. This invisible force 1 also draws down rain from the sky and causes the daily ocean tides. It keeps the earth in a spherical shape, and prevents our atmosphere from escaping into space. It would seem that this everyday gravity force should be one of the best understood concepts in science. However, just the opposite is true.