| A | B |
|---|
| Earth | the third planet from the sun |
| Moon | Earth's only natural satellite |
| Sun | the star at the center of the solar system |
| satellite | an object that orbits another one |
| axis | an imaginary line which an object such as Earth rotates |
| rotation | a turning or spinning motion around an axis |
| orbit | the path an object such as a planet, moon or satellite follows around a larger object such as the Sun |
| revolution | one complete circular movement made around something |
| moon phase | the changes in the shape of the moon |
| new moon | no visible moon |
| full moon | full visible moon |
| first quarter moon | half waxing moon |
| third quarter | half waning moon |
| seasons | the year divided into weather conditions such as fall, winter, spring,and summer |
| crater | a bowl-shaped hole on the surface of the Moon or planet caused by the impact of a meteorite |
