When you jump up in the air, why do you fall right back down to the ground instead of floating up into the sky? The reason is because there is an invisible force pulling us back down to Earth. This force is called gravity. Gravity is everywhere, not just on Earth. Every planet, moon and star has gravity.
In fact, the sun’s gravity is what keeps the planets in our solar system in their orbits around the sun. Without the sun’s gravity, the planets would fly off into space. Gravity helps us on Earth, too. It keeps our atmosphere, which is the air we breathe, close to the Earth. Without gravity, the atmosphere would float away into space and we wouldn’t be able to breathe.
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