| A | B |
|---|
| gravity | the force of attraction between two objects |
| inertia | the tendency of a moving object to keep moving |
| planet | a large object that orbits a star, but doesn't give off light or heat |
| star | an object in space that gives off heat and light |
| telescope | an instrument that is used to see far away objects |
| asteroids | bits of rock/ice that are located between Mars and Jupiter |
| comet | made of an mixture of gases, ice, dust, and rock |
| revolution | a trip around the sun |
| satellite | an object in space that circles another |
| constellation | pattern formed by stars |
| one revolution around the sun takes | 365 1/4 days |
| solar eclipse | when the moon passes between the earth and the sun |
| moon | a natural satellite |
| when the North Pole points toward the sun | it is summer in the Northern Hemisphere |
| new moon | none of the moon is showing |
| full moon | all the moon is showing |
| gibbous moon | 3/4 of the moon is showing |
| one rotation | takes 24 hours |
| if you know where the little dipper is | you can tell what direction north is |
| we have seasons | because the earth's axis is tilted |
