Across
- 4. a group of billions of stars, planets, dust, and gas all moving together.
- 7. scientists who study outer space.
- 8. all of space and everything in it including stars,planets,galaxies, etc.
Down
- 1. a spiral shaped galaxy where Earth is located.
- 2. the Sun and everything that orbits, or travels around the Sun.
- 3. become or make larger.
- 5. Capable of being observed or we can see it.
- 6. when something such as the Earth circles around the Sun.