Space Review

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