Across
- 3. Time when day and night are equal
- 5. Natural satellite orbiting the Earth
- 9. Light display caused by solar particles
- 10. Vast system of billions of stars
- 13. Rapidly rotating neutron star emitting radiation
- 14. Streak of light from a falling rock
- 16. Star at the center of our solar system
- 17. Temporary blocking of one celestial body
- 18. Luminous ball of gas held by gravity
- 19. Curved path of a planet or satellite
Down
- 1. Point directly above a specific observer
- 2. Icy body that develops a glowing tail
- 4. Cloud of gas and dust in space
- 6. Distant, high-energy galactic core
- 7. Space entirely devoid of any matter
- 8. Force attracting objects toward each other
- 11. Group of stars or galaxies held together
- 12. The red planet in our solar system
- 13. Large body orbiting a central star
- 15. The universe seen as a whole