Across
- 2. Cloud of gas and dust in space
- 5. Explosive death of a massive star
- 6. The universe as an orderly, harmonious system
- 8. Icy body that develops a tail near the Sun
- 9. Force that attracts objects toward each other
- 11. Small rocky body orbiting the Sun
Down
- 1. Invisible matter inferred from gravitational effects
- 3. Region in space with gravity so strong that not even light escapes
- 4. Extremely bright active galactic nucleus
- 7. A celestial body orbiting a star
- 9. A massive system of stars, dust, and gas
- 10. Theory explaining the origin of the universe