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Across 1. abbreviation for electromagnetic radiation 4. a moon that is increasing in visible surface 9. 29.5 days is a sidereal or lunar _?_ 10. material hurled out of a lunar crater during impact 13. longest wavelength EMR 15. describes a total solar eclipse when Moon is at apogee, leaving a ring of Sun 18. when Moon blocks Earth's view of Sun, or Earth blocks sunlight from Moon 19. location where Sun is 90 degrees overhead on equinoxes 20. 'c' stands for the speed of _?_ 22. shape of Moon's orbit around Earth (and Earth around Sun) 25. ground rock covering the lunar surface 26. effect that causes storms to rotate counterclockwise in North 29. telescope type that used an object lens 33. describes moons orbital period that matches its rotational period 34. Moon phase when there is NO moon 35. Sun's maximum height at midday 36. first person to set foot on the moon 38. when the Sun-Earth-Moon align this causes _?_ tides 39. seismic vibration in the lunar surface 41. electromagnetic waves arranged from longest to shortest 42. radio telescopes in New Mexico are collectively the "very large _?_" 44. exactly one rotation of the moon in 27.3 days is a _?_ month 50. farthest point from Earth along Moon's orbit 51. March 21 is the _?_ equinox 52. angle between the sun and horizon 53. noon to noon (24 hr) is a _?_ day 54. unit of frequency 55. 2015 is the 25th anniversary of the "_?_ space telescope"

Down 2. Earth's only natural satellite 3. Moon's gravitational pull on Earth's oceans causes _?_ 5. moon phase between quarter and full moons is waxing or waning _?_ 6. Mars-sized object the may have impacted Earth, forming the Moon 7. when Sun-Earth is perpendicular to Earth-Moon this causes _?_ tides 8. shortest wavelength EMR 9. flat, dark plains on the lunar surface 11. reflectivity of a surface (Moon's is 7%) 12. 23.5 degrees N of the equator is the Tropic of _?_ 14. lunar surface features formed by impacts 16. telescope type that uses an objective mirror 17. crest to crest distance 18. path the Sun/planets follow through the sky/'heavens' 19. day the hours of daylight and darkness are equal 21. mountainous region on the lunar surface 23. telescopes are placed on mountains to avoid the _?_ 24. Curiosity is a space craft that landed on Mars in 2012 27. number of waves per second 28. exactly 1 rotation of Earth is a _?_ day 30. pendulum that demonstrates Earth's rotation 31. day the hours of darkness are longest is the winter _?_ 32. part of Moon's shadow that causes a partial solar eclipse as it passes 33. primary mineral forming lunar surface (Si + O) 37. device for viewing distance objects in space 40. season that begins when N. hemisphere leans directly toward Sun 43. lunar valleys, perhaps formed by collapsed lava tubes 45. phase of moon when Earth is between the Sun and Moon 46. closest point to Earth along Moon's orbit 47. 2015 is 10th anniversary of launch of Cassini probe that orbits _?_ 48. Moon's inner shadow cone that results in total solar eclipse as it passes 49. New Horizons is a probe scheduled to reach _?_ in summer, 2015