Earth, Sun, Moon

Front

The layer of gas surrounding planet Earth that is held in place by gravity

Back

Atmosphere

Front

Bowl-shaped indents or cavities on the surface of a planet, moon, or asteroid that are caused by a collision with another object, such as a meteorite

Back

Craters

Front

The third planet from the Sun and the only planet in the solar system where life exists

Back

Earth

Front

A natural satellite that orbits a planet; some planets have no moons, and others have over 60 moons.

Back

Moon

Front

The star at the center of the solar system that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit

Back

Sun

Front

The outermost covering or layer

Back

Surface

Front

The heaviness of an object; force of gravity on mass

Back

Weight

Front

Making a complete turn around another object

Back

Revolution

Front

Making a complete spin on an axis

Back

Rotation

Front

The path one object takes as it revolves around another object in space

Back

Orbit