Across
- 2. A large system of stars, gas, and dust held together by gravity
- 4. Icy body that leaves a bright trail of gas and dust when close to the Sun
- 5. A natural satellite that orbits a planet
- 8. A region in space with gravitational pull so strong that nothing, not even light, can escape
- 9. Small rocky body that orbits the Sun, often in the asteroid belt
Down
- 1. Extremely bright and distant active galactic nucleus
- 3. A stellar explosion that briefly outshines an entire galaxy
- 5. A small body of matter that enters Earth's atmosphere
- 6. A large celestial body that orbits a star
- 7. A cloud of gas and dust in space, often a region of star formation