Gravity is the attraction between objects that have mass. On Earth, gravity pulls objects toward the planet's center, which is why things fall downward and why people have weight.
Gravity beyond Earth
Gravity keeps the Moon in orbit around Earth, Earth in orbit around the Sun, and many objects in stable paths through space. It also helps planets hold onto atmospheres.
Is gravity only on Earth?
No. Gravity exists everywhere, but its strength depends on mass and distance. Larger objects usually have stronger gravitational pull.
Gravity is also part of why space events like a solar eclipse can be predicted so accurately.