| A | B |
|---|
| constellation | Group of stars that forms a pattern in the night sky. |
| axis | Imaginary rod stretching between Earth's North and South Poles. |
| rotation | The spinning of an object on its axis. |
| revolution | The movement of an object around another object or point. |
| star | A huge globe of hot gases that shines by its own light. |
| planet | A large body in space that orbits a star and does not produce light on its own. |
| refracting telescope | An instrument for viewing distant objects that uses two lenses to gather light and produce an image. |
| reflecting telescope | An instrument for viewing distant objects that uses a curved mirror at the back of its tube to gather light and produce an image. |
| comet | A small object in space, made of ice, dust, gas and rock, that orbits a star and that can form a gaseous tail. |
| meteor | A piece of rock or metal from space that enters Earth's atmosphere. |
| meteorite | The remaining material of a meteor that has landed on the ground. |
