Across
- 1. A hot ball of glowing gas in space
- 3. The star at the center of the solar system
- 4. The center of a galaxy
- 6. Astronomical Unit
- 7. A scientist who studies stars, planets, and other objects in space
- 8. How far light travels in one year
- 10. The shape of our galaxy
Down
- 2. What scientists use to learn about space
- 3. The area beyond earth
- 5. The name of our planet
- 9. A group of hundreds of billions of stars