Gravity

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Q1: What force holds the planets in orbit around the Sun?

[Answer]

The biggest force in the Universe is called gravity. Gravity gives everything its weight.

The bigger something is, the bigger the force of gravity it has. So the Earth has a bigger force of gravity than the Moon, and the Sun has a much bigger force of gravity than the Earth.

Gravity stops us, and everything on Earth, from floating off into space.