Across
- 2. The type of light that carries more energy than visible light
- 4. The distance that light can travel in one year.
- 7. Scientists who study space
Down
- 1. A group of stars that form a pattern
- 3. Includes planets, moons, asteroids, and comets.
- 5. The process that combines atoms and releases energy.
- 6. A large group of stars, planets, gas, and dust stuck together by gravity.