Astronomy Crossword

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Across
  1. 4. The eye of Taurus (9)
  2. 8. The red planet (4)
  3. 10. A Newtonian telescope requires this from time to time (11)
  4. 15. Have been identified orbiting distant stars (10)
  5. 17. Developed the general theory of relativity (8)
  6. 19. Group of stars, can be "open" or "globular" (7)
  7. 20. A cataclysmic explosion at the end of the life of some stars (9)
  8. 21. Planet which rotates once on its axis every 59 days (7)
  9. 22. Icy cloud at the outermost limits of our solar system (4)
  10. 24. Discovered in 1781 (6)
  11. 25. When one object moves in front of, and hides another (11)
  12. 27. The Dog Star (6)
  13. 28. A body that revolves around another body (9)
  14. 32. Type of galactic arms (6)
  15. 33. Reflective property of a non-luminous surface (6)
  16. 34. The Hunter (5)
  17. 36. The demon star (5)
  18. 37. Area of dust and gas surrounding the nucleus of a comet (4)
  19. 38. There are 60 of these in one degree of arc (7)
  20. 39. An exceptionally bright meteor (6)
  21. 40. Constellation featuring Castor and Pollux (6)
  22. 42. An object in the sky with a magnitude of about -27 (3)
Down
  1. 1. A nebulae which shares its name with a crustacean (4)
  2. 2. Common center of mass about which two or more bodies revolve (10)
  3. 3. An inferior planet (5)
  4. 5. A comet hunter, remembered for his catalogue of DSOs (7)
  5. 6. Determines the light gathering potential of a telescope (8)
  6. 7. Explosion of hot gas from the surface of the sun (10)
  7. 9. Comet with a 75-76 year orbit (7)
  8. 11. A galaxy with the alternative name of M31 (9)
  9. 12. Night time clouds best seen in the summer months (11)
  10. 13. A type of dwarf star (5)
  11. 14. Moon of Jupiter (2)
  12. 16. The northern hemisphere pole star (7)
  13. 18. The name of Patrick Moore's Selsey home (9)
  14. 23. Comets commonly have two of these (4)
  15. 26. A belt of these reside between Mars and Jupiter (9)
  16. 29. Angular measure of the height of an object above the horizon (9)
  17. 30. Constellation which features the sickle (3)
  18. 31. 3.2616 light years (6)
  19. 35. The opposite of zenith (5)
  20. 41. Where would you find maria, craters and rilles (4)