Space

The moon is a natural  ______ of Earth.

• comet
• axis
• satellite
• space probe

The planet spins around an imaginary line called its _____.  

• satellite
• axis
• equator
• revolution

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

• phase
• asteroid
• axis
• comet

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

• rotation
• revolution
• phase
• comet

One kind of  _______ is the crescent Moon.  

• axis
• asteroid
• phase
• space probe

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

• axis
• rotation
• revolution
• satellite

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

• solar system
• earth
• rotation
• United States

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

• planet
• space probe
• satellite
• meteor

The force that keeps planets on there orbit...

• orbit
• stars
• planets
• gravity

Does this picture represent a waxing or waning moon?

• waxing 
• waning