The solution
Across
1. CATENA—Chain of craters, eg on the Moon
3. COLUMBA—The Dove
5. VIXEN—cat-like eyepiece brand
8. CASTOR—Star name Actors (anagram)
10. COMA—Dust or gas around a comet - focal aberration in a lens
11. PEACOCK—Star name Cake Cop - in Pavo (anagram)
12. ALPHERATZ—Brightest in Andromeda - or is it Pegasus?
14. WATSON—This astromomer was in the 'Bradford and East Fife Ready Mixed Concrete Company' band.
16. HYDROGEN—what our Sun is mostly composed of
18. PEGASUS—Constellation, also 1974 hit tune by Ross Ryan
21. VESTA—Large asteroid - wax match
22. CAELI—The Sculptor's Chisel
23. EPOCH—Date reference for celestial co-ordinates
24. SIX—How many Moderators IIS has
27. TERMINATOR—Boundary between light and shadow - Arnie's best known film role
30. OORT—.... Cloud, a distant diffuse cloud of comets around our Sun
36. SACKETT—Director of Stromlo, then Australia's Chief Scientist
37. ORRERY—Clockwork Solar System model
39. JUPITER—Himalia is a moon of which planet?
40. NORMA—Constellation Roman (anagram)
41. VENUS—Planet closest in size to Earth
42. FLATS—Images of a uniformly illuminated field - Blocks of apartments
43. LIBRA—The Scales
44. APHELION—Furthest orbital point from the Sun
Down
2. ATACAMA—Desert in Chile, scene of much observatory construction
4. MERCURY—The smallest planet
5. VOLANS—The Flying Fish
6. TOM—Major ... was a Space Oddity
7. SATURN—Dione is a moon of which planet?
9. CANNON—Oh Be A Fine Girl, Kiss Me.....it wasn't Kate, it was Annie...?
13. FOMALHAUT—Mouth of the Southern Fish (star)
15. STACKING—Combining separate images, eg with software
17. ERIDANUS—Constellation Air Nudes (anagram)
18. PLANITIA—Low plain, eg on the Moon
19. SPACE—Deep Purple tour of the Solar System 1
20. CERNAN—Last man on the moon
25. LIMB—Edge of the apparent disk of a body - humans have four
26. FORNAX—Laboratory Furnace, or Brazier
28. ROBBY—Robot in 'Forbidden Planet'
29. LOWELL—Astronomer who saw "canals" on Mars
31. RETROGRADE—Backwards apparent motion of a planet
32. SPECULUM—Metal used for early telescope mirrors
33. ALDEBARAN—Red giant in Taurus - "The Follower"
34. MONS—Huge Martian volcano, Olympus ....
35. DIURNAL—Relating to the day
38. DELOS—Televue at the birthplace of Apollo
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