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Gravity's role is to keep the planets in orbit and balance.
The speed, or velocity, of the planets plays a big role in their orbits, including the shape of the orbit. For a planet to remain in orbit around the sun and not fall into it, the planet must have a speed fast enough to keep it at a certain distance from the sun.any people know that the planets in Earth's solar system move around the sun in orbits. This orbit creates the days, years and seasons on the Earth. However, not everyone is aware of why the planets orbit around the sun and how they remain in their orbits.