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

He invented an anti-gravity device.

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

In a state of weightlessness, objects float freely.

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 person with a strong heart.