Across
- 1. a space empty of matter six
- 3. moving around a celestial body eight
- 8. a body that orbits a planet nine
- 9. a system of millions of stars six
- 10. a region in space with strong gravity nine
- 12. the force that attracts a body toward the center of the earth six
- 14. an astronomical event seven
Down
- 2. a space rock in Earth's atmosphere six
- 4. a cloud in outer space six
- 5. cosmic particles four
- 6. an instrument for observing distant objects nine
- 7. distance light travels in one year nine
- 8. light from a star nine
- 11. the universe six
- 13. a small rocky body seven