Across
- 2. a scientist who studies space
- 3. the process that combines atoms and releases energy in a star
- 4. a group of stars that form a pattern
- 6. a scientist who made discoveries about inertia
- 7. the distance that light can travel in one year
- 9. a set of connected parts that work together
- 10. the proper name of the North Star
Down
- 1. a form of light that carries more energy than visible light
- 5. the name of our galaxy
- 8. a large group of stars, planets, and dust stuck together by gravity