Restricted Category

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Across
  1. 6. a principle central to general relativity
  2. 11. a moon of mars
  3. 14. occurs in between solstices
  4. 15. discovered first cepheid variable in 1923
  5. 16. popularized the apparrent paradox of why the night sky is not bright
  6. 17. archer constellation
  7. 18. proposed many-worlds interpretation
  8. 20. such charges produce EM waves
  9. 21. red planet
  10. 23. equation that estimates the number of extraterrestrial civilizations in the galaxy
  11. 24. Dutch inventor of the telescope
  12. 27. two words; our sun is here on the HR diagram
  13. 29. apparent backward motion
  14. 33. a book written by isaac newton
  15. 36. missions to the outer planets (1977-1989)
  16. 38. two words; average sun-earth distance
  17. 40. Europa’s orbit is like this
  18. 42. two words; common end product of stellar evolution
  19. 43. a moon of mars
  20. 44. a point of infinite density and zero volume
  21. 45. two words; ‘line of sight’ double stars
  22. 50. type of star cluster
  23. 51. largest crater on the moon
  24. 55. type of particle including electron and muon
  25. 56. two words; diameter of light shaft exiting an eyepiece
  26. 57. two words; final phase of Solar System’s formation
  27. 58. Greek astronomer. Measured the circumference of the Earth.
  28. 62. greek astronomer who introduced magnitude
  29. 64. another name for prominences
  30. 65. two words; this stripped away atmosphere of Mars
  31. 66. apparent to-and-fro motion of the moon’s face
  32. 67. part of the sun’s atmosphere
  33. 69. lets us calculate how fast an object is receding
Down
  1. 1. came up with laws of planetary motion
  2. 2. the U in GUTs; string theory is one of these
  3. 3. constellation. contains tarantula nebula.
  4. 4. source of power in stars
  5. 5. the moon’s gravity causes these on earth
  6. 7. two words; a black hole has this
  7. 8. concept violated by instantaneous action-at-a-distance
  8. 9. smallest planet
  9. 10. the arab astronomer al-sufi revised his star catalogue
  10. 12. layer of the sun from which light is emitted into space
  11. 13. two words; lowest limit of temperature
  12. 19. saturn is famous for these
  13. 22. zero line for longitude
  14. 25. two words; thought to accelerate universe expansion
  15. 26. two words; type of star orbited by gliese 581c
  16. 28. largest moon in the solar system
  17. 30. famous constellation. hunter.
  18. 31. caused by meteorites
  19. 32. the point directly overhead
  20. 34. two words; imaginary hollow sphere around the earth
  21. 35. two words; venus has clouds of this
  22. 37. phenomenon; wobble of earth’s axis
  23. 39. used to determine chemical composition of stars
  24. 41. the name of our planet
  25. 43. a direct method for finding distance to a star
  26. 46. two words; northern lights
  27. 47. also called ‘oligarchs’ because they controll their surroundings
  28. 48. nodding motion
  29. 49. huge, gravitationally bound cluster of stars, dust, gas
  30. 52. discovered moons of jupiter
  31. 53. two words; local cluster of galaxies containing the milky way
  32. 54. two words; constellation between bootes and hercules, asterism of seven stars
  33. 59. aberration. disadvantage of refractors
  34. 60. common name for M101
  35. 61. group of stars
  36. 63. north-south arc in the sky; the M in AM/PM
  37. 68. splits light into a spectrum