Solar System

A small piece of rock moving in space.

Large holes caused by meteorite impacts.

A group of stars that forms a pattern.

When the lit part of the moon appears to be shrinking.

Gigantic balls of very hot gases that give off radiation.

The rise and fall of the ocean level.

One full orbit around the sun.

Earth's natural satelite.

The outer layer of the sun.

A meteor that strikes the surface of a moon or planet, leaving a crater.

A force between two objects.

The first four planets from the sun.

When the lit part of the moon appears to be growing.

When the lit part of the moon changes shape as we view it.

A spacecraft that gathers data without a crew.

Also known as the North Star.

A frozen mass of ice and dust orbiting the sun. Usually leaves behind debris called a tail.

The outer layer of the sun.

Dark spots located in the photosphere of the sun.

An imaginary line around which an object spins.