The sun, planets, and all the other objects that revolve around the sun.

All of space and everything in it.

A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

A celestial body moving in an elliptical orbit around a star.

A celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classified as such.

A small rocky or metallic object that orbits the sun.

A ball of frozen dust and rock that orbits the sun and has a tail that glows.

A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.

Half of the Earth.

A natural satellite that revolves around a planet.

The movement of an object around another object.

The turning of an object on its axis.

It takes _______ for the earth to _________ around the sun.

It takes _______ for the earth to _________ one time on its axis.