| A | B |
|---|
| constellation | a group of stars that form a pattern in the night sky |
| axis | an imaginary rod stretching through the planet between the north and south pole |
| rotation | turning around on its axis |
| revolution | one rotation about an axis, takes 365 days for planet earth |
| star | a huge globe of hot gasses that shines by its own light |
| planet | a large object that circles a star and does not produce its own light |
| refracting telescope | an instrument for viewing distant objects that uses two lenses to gather light and produce an image |
| reflecting | gathers light in a curved mirror at the back of its tube. |
| comet | an icy ball that contains dust and rock and travels in an elliptical orbit around the sun |
| meteor | a piece of rock or metal from space that enters earth's atmosphere |
| meteorite | the remaining material of a meteor that has landed |
