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The sun,planets,and the moon
A ball of hot, glowing gas
A large body of matter that moves around a star
The sun, the planets, and their moons, and other objects that move around the sun
A large hole in the ground shaped like a bowl
An imaginary line through the center of the earth around which the earth rotates
To spin on an axis
The path an object follows as it moves around another object
Movement of an object in an orbit around another object
An object that revolves around another object
The shape of the lighted part of the moon
An instrument for making distant objects appear nearer and larger
A person who travels in space