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This week's theme: Astronomy

Across

1. Shiner of the Solar System
4. Isinglass
8. "This is the dawning of the ___ of Aquarius..."
11. Capital of Italy
12. Charge Card, commonly
13. Greek astronomer who proposed a heliocentric theory of the Universe: Aristarchus of ___ (fl. c.310 B.C - c.230 B.C.)
16. American astronomer who discovered that the Universe is expanding
18. Newport's locale, on an env.
19. American astronomer Clyde Tombaugh's discovery in 1930
20. Genuine
21. Bird's or Hornet's
23. The Rolling Stones hit: "Time ___ My Side"
24. It's seen with "Comet" ...but only every 70 years, or so!
26. Computer in #53D
28. Williams' Works: Pl___
29. Astronomical fireballs
33. Romantic comedy of 1999: "___ All That"
36. Turkish Title (var. sp.)
39. Astronomical occurrence of JANUARY 21ST, 2000 (With #45D and #55D)
40. It's a cheerleader's prop, when doubled
41. Australis and Borealis
43. Bolo or Bow
44. UFO occupant
46. Affiliation, for short
47. Model
48. The Caloris Basin is located here
50. Compass direction
52. Little records
53. Challenger or Columbia or Discovery, partially
57. Desert in Asia
60. Gala Gentry, for short
62. Skipper and Gilligan lived in ___ on "Gilligan's Island"
63. Giraffe-like mammal
65. Partner for Pa
66. Sir William Herschel first detected it on March 13th, 1781
68. Hard to penetrate
69. Shakespeare's Sections
71. Carmen Laforet novel of 1944
72. Hamburg's locale, briefly
73. Actress Campbell
74. Before, before

Down

1. Planet Earth Point: The ___ Pole
2. Shadow of the Earth during #39A
3. Diffuse masses of interstellar gas and dust
4. Ms. West
5. "___ a Man": Chicago hit
6. Largest and first ever discovered asteroid
7. The Earth spins on it
8. Cleopatra's Cobra
9. He constructed the first astronomical telescope, in 1609
10. They're flightless in Australia
11. Blood related acronym
14. "Logy" prefix
15. Elvis to Gladys
17. Dutch portrait painter
21. U.S. state
22. "Close Encounters of ___ Third Kind" (1977)
25. Bible Study!: His brother was Jacob
27. Lawyers, for short
29. Red Planet
30. Director Preminger
31. Train track part
32. Rosebud, for one
33. Junk e-mail
34. Black ___: Not even light can escape from this intense gravitational field
35. Middle East chieftain
37. Dull
38. Hebrew prophet of 8th cent. B.C.
41. "And since the Universe must have an extremity and a center, it must clearly have ___ and down." - Aristotle, "On the Heavens"
42. Korean apricot
45. See #39A
47. The atmosphere of Saturn consists of ammonia, helium, hydrogen and ___
49. Bible type acronym
51. Celestial body
53. "2001: A ___ Odyssey" (1968)
54. Learning locale, for short
55. See #39A
56. "Study" in Strasbourg
57. Jupiter or Neptune, in Roman Mythology
58. Feed fuel to the fire by adding this ending to "st"
59. Big ___ Theory: Theory that holds that the Universe was formed by a massive cosmic explosion billions of years ago
61. David Bowie's supermodel wife
64. "Funn" finale
66. Apply
67. Initials of the husband of Jayne Meadows
70. Telly