| A | B |
|---|
| light year | the distance light travels in one year |
| AU | astronomical unit |
| rocket | spacecraft with a powerful engine |
| space shuttle | spacecraft that explores space |
| space station | permanent spacecraft where people can live |
| supernova | the explosion of a massive star |
| black dwarf | gives off no light |
| spectrum | the bands of light given off by a star |
| Polaris | the North Star |
| satellite | orbiting spacecraft |
| radio telescope | can "see" through dust and pollution |
| light telescope | uses light waves to "see" |
| Mir | Soviet satellite launched in 1986 |
| Hubble | satellite telescope |
| Kilometer | km |
| Spiral | type of galaxy with two arms |
| Milky Way | our galaxy - a spiral |
| elliptical | football shaped galaxy |
| irregular | galaxy without a certain shape |
| Proxima Centauri | the closest star to us |
