Across
- 2. The process that combines atoms and releases energy.
- 3. Carries more energy than visible light.
- 7. A group of stars that form a pattern.
- 8. The distance that light can travel in one year.
- 10. All scientists look for _________________________.
- 11. Scientists ask _____________________________.
- 12. A set of connected parts that work together.
Down
- 1. All stars release _______________________.
- 4. A proposed explanation for an event.
- 5. The North Star.
- 6. A large group of stars, planets, gas and dust stuck together by gravity.
- 9. Scientists who study space.