Across
- 4. nothing can escape this
- 8. displacement of the spectrum of an astronomical object towards longer wavelengths
- 10. 365.25 days
- 12. north star
- 13. 3rd brightest natural object in earth's night sky
- 14. sun appears to reach its northward/southward extreme relative to celestial equator
- 15. displacement in the apparent position of an object viewed along two different lines of sight
- 17. the point in the orbit of the satellite at which it is farthest from the earth
- 20. luminous stellar explosion
Down
- 1. colored rings around the sun
- 2. interstellar cloud of dust and gases
- 3. northern lights
- 5. small, rocky object orbiting the sun
- 6. model in which sun is at the center of the universe
- 7. subatomic particle with no charge and negligible mass
- 9. 3 celestial bodies in straight line
- 11. orion
- 16. instrument to observe distant objects
- 18. partial/complete obscuring of a celestial body by another
- 19. universe as a complex system