| A | B |
|---|
| astronomy | study of the universe |
| universe | everything the exists (including Earth, the planets, the stars, and all of space) |
| telescope | a device that collects light and magnifies distant images to make them look closer, larger, and brighter |
| rotation | one complete spin on an axis |
| standard time zone | a vertical belt, about 15 degrees wide longitude, in which all locations have the same time |
| international Date Line | the 180 degree of longitude (going west acros it adds a day and going east subtracts a day) |
| revolution | one complete trip around the Sun |
| visible light | light that you can see with your eyes |
| refracting telescope | uses lenses to gather light from a faraway object |
| reflecting telescope | visible light reflects off a series of two or more mirrors |
| invisible light | light that people cannot see |
| apparent path | the Sun appears rises in the east and sets in the west as a result of Earth's rotation |
| space shuttle | a reusable spacecraft |
