Space

Front

The moon is a natural  ______ of Earth.

Back

satellite

Front

The planet spins around an imaginary line called its _____.

Back

axis

Front

An ice ball that has a very long elliptical orbit is called a  _________.

Back

comet

Front

Earth's ________ on its axis causes day and night.

Back

rotation

Front

One kind of  _______ is the crescent Moon.

Back

phase

Front

One full orbit of an object around another object is called a ________.

Back

revolution

Front

The __________ has planets, moons, comets, and asteroids.

Back

solar system

Front

A spacecraft that does not carry people is a (an) ______________.

Back

space probe

Front

The force that keeps planets on their orbit...

Back

gravity

Front

Does this picture represent a waxing or waning moon?

Back

waning