Across
- 1. A huge collection of stars, gas, and dust held together by gravity
- 4. Path an object takes around another in space
- 6. Way The galaxy that contains our solar system
- 7. A huge explosion that marks the death of a massive star
- 8. The star at the center of our solar system
- 9. The boundary marking the beginning of outer space above Earth
Down
- 1. The force that keeps planets in orbit around the sun
- 2. A large, bright object in space made mostly of hydrogen and helium
- 3. Earth’s natural satellite
- 5. A space traveler
- 6. the red planet