What Causes ‘Gravity’ and How Does It Affect Other Planets?

Imagine you're holding a ball. When you let it go, it falls to the ground because of gravity. Gravity is like an invisible string that pulls things toward each other, like Earth pulling you down and you pulling Earth up! It's what keeps planets in orbit around the Sun, too.

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Examples

If you jump on Earth, gravity pulls you back down. If you jumped on the Moon, you'd float higher because it has less gravity.
A ball falls faster on Earth than on Mars because Earth's gravity is stronger.
You feel lighter on a spaceship far from Earth because there’s less gravity pulling you.

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Categories: Physics · gravity,planets,space