astronomy

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Across
  1. 4. Blocking of celestial light
  2. 5. Streak of light from falling debris
  3. 8. Sun-centered system
  4. 9. Interstellar cloud of dust and gas
  5. 12. Outer atmosphere of the Sun
  6. 15. Moon phase more than half lit
  7. 16. Massive system of stars
  8. 18. Measurement of stellar positions
  9. 20. Horizontal coordinate angle
  10. 21. Table of celestial coordinates
  11. 24. Force of attraction between masses
  12. 26. Small rocky body orbiting the Sun
  13. 27. Apparent origin point of a meteor shower
  14. 28. Polar light display
Down
  1. 1. Farthest point from the Sun
  2. 2. Study of the universe
  3. 3. Table of celestial coordinates
  4. 4. Blocking of celestial light
  5. 6. Extremely luminous active core
  6. 7. Band of colors from dispersed light
  7. 10. Distance light travels in one year
  8. 11. Extremely bright fireball meteor
  9. 13. Curved path of a celestial body
  10. 14. Star system with two suns
  11. 17. Measure of star brightness
  12. 19. Point directly overhead
  13. 20. Traveler in space
  14. 22. Highly active distant galactic nucleus
  15. 23. Bowl-shaped impact depression
  16. 25. Constellations along the ecliptic path