Across
- 3. a person we send to outer space
- 5. the place where our solar system is found
- 8. a constantly expanding vacuum
Down
- 1. they can be made up of rock or gas but still orbit the sun
- 2. the place where all of the solar systems and galaxies exist
- 4. things you see in the night sky
- 6. large rocks that orbit planets
- 7. things that contain many different solar systems and stars