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Across
  1. 1. What does the observation that distant galaxies move away faster imply about the universe?
  2. 6. Which Moon phase rises around midnight, reaches the meridian around 6 AM, and sets around noon?
  3. 11. What geographic factor affects which constellations are visible?
  4. 12. What is the group of more than 80 galaxies that includes the Milky Way and Andromeda?
  5. 14. What do we call a group containing many galaxies?
  6. 15. What is the approximate date of the spring equinox?
  7. 17. Why does the hemisphere tilted toward the Sun experience warmer seasons?
  8. 18. How many official constellations are there?
  9. 23. Approximately how many stars can we see with the naked eye on a clear dark night?
  10. 25. In which direction does Earth rotate?
  11. 26. What is the approximate radius of Earth?
  12. 27. What astronomer discovered that galaxies are moving away from us?
  13. 28. Which Moon phase rises around 9 PM, reaches the meridian around 3 AM, and sets around 9 AM?
  14. 30. During which direction does the illuminated portion appear during the waxing phases?
  15. 31. What is the speed of light in kilometers per second?
  16. 32. Which Moon phase rises around 6 PM, reaches the meridian around midnight, and sets around 6 AM?
  17. 34. What is the point directly above an observer called?
  18. 35. What unit is commonly used to describe distances within our solar system?
  19. 37. What unit is commonly used to describe the distances between stars and galaxies?
  20. 40. What must occur between the Sun, Earth, and Moon for an eclipse to happen?
  21. 44. What point on the celestial sphere is directly above Earth’s South Pole?
  22. 46. What type of eclipse occurs when the Moon comes between the Sun and Earth?
  23. 48. Which Moon phase rises around 9 AM, reaches the meridian around 3 PM, and sets around 9 PM?
  24. 51. What imaginary flat surface passes through the center and disk of the Milky Way?
  25. 52. During a solar eclipse, whose shadow falls on Earth?
  26. 56. What is caused by Earth’s 23.5 degree tilt?
  27. 57. Which Moon phase rises around 3 AM, reaches the meridian around 9 AM, and sets around 3 PM?
  28. 59. What is the name for when we receive approximately equal amounts of daylight and nighttime?
  29. 60. What is a great island of stars held together by gravity and orbiting a common center?
  30. 62. What galaxy contains our Solar System?
  31. 63. What part of the Milky Way contains our Solar System?
  32. 65. What do we call a cluster of galaxy clusters?
  33. 66. Why does angular size not tell us an object’s true physical size?
  34. 68. What is the altitude of the zenith?
  35. 69. Which Moon phase rises around 6 AM, reaches the meridian around noon, and sets around 6 PM?
Down
  1. 2. What is the flat plane defined by Earth’s orbital path around the Sun?
  2. 3. What type of object is not massive enough to undergo nuclear fusion?
  3. 4. What is another name for the spring equinox?
  4. 5. What is the portion of the entire universe that we can potentially observe?
  5. 7. What is another name for the fall equinox?
  6. 8. During a lunar eclipse, whose shadow falls on the Moon?
  7. 9. Why do the Sun and Moon appear to have approximately the same angular size?
  8. 10. What is the approximate age of the universe in years?
  9. 13. Which Moon phase rises around noon, reaches the meridian around 6 PM, and sets around midnight?
  10. 16. Approximately how far are we from the center of the Milky Way?
  11. 19. What is the approximate radius of the Sun?
  12. 20. During which direction does the illuminated portion appear during the waning phases?
  13. 21. What type of object is massive enough to undergo nuclear fusion?
  14. 22. What is a region of the sky with well-defined borders?
  15. 24. What is the approximate distance to the boundary of the observable universe in light years?
  16. 29. What is the angle separating two objects in the sky called?
  17. 33. In which direction do stars appear to move across the sky?
  18. 36. What type of eclipse occurs when Earth comes between the Sun and Moon?
  19. 38. What point on the celestial sphere is directly above Earth’s North Pole?
  20. 39. What imaginary sphere surrounding Earth is used to map the sky?
  21. 41. What is Earth’s approximate axial tilt in degrees?
  22. 42. What describes how large an object appears in your field of view?
  23. 43. What is the approximate angular size of both the Sun and Moon?
  24. 44. What must one astronomical object pass through for an eclipse to occur?
  25. 45. What is the approximate date of the autumn equinox?
  26. 47. What is the projection of Earth’s equator onto the celestial sphere?
  27. 49. What motion of Earth causes stars to appear to rise and set?
  28. 50. What do we call the Sun and everything that orbits it, including planets, dwarf planets, and small bodies?
  29. 53. Which Moon phase rises around 3 PM, reaches the meridian around 9 PM, and sets around 3 AM?
  30. 54. What is 1/60 of a degree called?
  31. 55. What is the Sun’s apparent path through the celestial sphere?
  32. 58. What is the name of the large galaxy also known as M31?
  33. 61. What is 1/60 of an arcminute called?
  34. 64. What is a familiar pattern or grouping of stars used to help locate constellations?
  35. 67. What second factor affects which constellations are visible?