Solar System Vocabulary

the act of spinning on an axis. Each complete orbit Earth makes around the sun.

an imaginary straight line through the center of the earth around which the earth rotates

a closed path that an object follows as it moves around another object

a large body of matter revolving around the sun

a person who travels in space

the rise and fall of the ocean, mainly due to the moon's gravity

the sun, the planets and their moons, and other objects that revolve around the sun

movement of an object in orbit around another object

the shape of the lighted part of the moon as seen from Earth. A crescent moon is one _______of the moon.

The sun is the closest _______ to Earth.

a large hole in the ground that is shaped like a bowl

an instrument for making distant objects appear nearer and larger

object that revolves around another object

a person who travels in space