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