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