The gravity of the Earth is stronger than the gravity of the Moon.

In a state of weightlessness, objects float freely.

He invented an anti-gravity device.

The study of gravitational waves contributes greatly to our understanding of the universe.

Gravitational interaction creates attraction between objects.

Earth is one of the planets in the solar system.

It's a beautiful night with the moon.

This tree is very hard.

He chose that method against his will.

He is a very strong person.