Across
- 4. quality of emitting or reflecting light
- 7. branch of physics that studies celestial bodies
- 8. point below the observer directly opposite the zenith
- 9. building equipped to view astronomical phenomena
- 10. or relating to or resembling or emanating from stars
- 14. straight line through a body or figure
- 17. immense cloud of gas and dust in interstellar space
- 19. mass that enters earth's atmosphere, becoming incandescent
- 20. nearest point in an orbit around the Earth
- 23. star that explodes and becomes luminous in the process
- 24. phenomenon when one celestial body obscures another
- 25. degenerate neutron star that emits polarized radiation
Down
- 1. path of a celestial body in its revolution about another
- 2. outermost region of the sun's atmosphere
- 3. starlike object that may send out radio waves
- 5. like an egg
- 6. to the sun or utilizing the energies of the sun
- 11. force of attraction between all masses in the universe
- 12. highest point of something
- 13. absence of matter
- 15. small celestial body composed of rock and metal
- 16. or relating to or associated with the moon
- 18. farthest point in an orbit around the Earth
- 21. collection of star systems
- 22. in phase