2. Light year is: Distance that light travels in a vacuum in one year, about 9.5 trillion km - which is used to record distances between stars and galaxies

3. Light year is:

4. Light year is not: Light year is a measure of DISTANCE – NOT TIME!!!!!!

5. Light year is:

7. SPEED of LIGHT is: Lite Coke Diet Coke

8. SPEED of LIGHT is not:

9. BIG BANG THEORY is: A theory that states that about 12 billion to 15 billion years ago, the universe began with a huge, fiery explosion.

10. BIG BANG THEORY is:

11. BIG BANG THEORY is not:

12. BIG BANG THEORY is: A theory that states that about 12 billion to 15 billion years ago, the universe began with a huge, fiery explosion.

13. BIG BANG THEORY is:

14. UNIVERSE is: the totality of everything that exists, including all matter and energy, the planets, stars, galaxies, and the contents of intergalactic space.

15. UNIVERSE is:

16. UNIVERSE is not:

17. UNIVERSE is:

19. Galaxy is: Large group of stars, dust and gas held together by gravity; can be elliptical, spiral, and irregular

20. Galaxy is:

21. Galaxy is not:

22. Galaxy is: Irregular Galaxy

23. NEBULA is: is an interstellar cloud of dust, hydrogen, helium and other ionized gases. WHERE A STAR IS BORN!

24. NEBULA is:

25. NEBULA is:

26. is an interstellar cloud of dust, hydrogen, helium and other ionized gases. WHERE A STAR IS BORN! NEBULA is:

27. NEBULA is:

28. STAR is: A huge object in space made up of gas and giving off light and heat from nuclear reactions; the sun is a star

29. STAR is:

30. STAR is not:

31. STAR is:

32. MAIN SEQUENCE STAR is:

33. MAIN SEQUENCE STAR is: A "main sequence star" is not really a type of star but a period in a stars life. When a star is in "main sequence" it is converting hydrogen into energy. It is then usually called a dwarf star. This is the longest period in a stars lifetime.

34. MAIN SEQUENCE STAR is:

35. MAIN SEQUENCE STAR not is:

36. MAIN SEQUENCE STAR is:

37. PLANETARY NEBULA is:

38. made up of gas and plasma, they are made by certain types of stars when they die. PLANETARY NEBULA is:

39. PLANETARY NEBULA is:

40. PLANETARY NEBULA is not:

41. PLANETARY NEBULA is:

42. Luminosity is:

43. a measure of the radiant power emitted by a star.

44. Luminosity is:

45. Luminosity is not:

46. Luminosity is: a measure of the radiant power emitted by a star.

47. Luminosity is:

48. a measure of the radiant power emitted by a star.

49. Hertzsprung-Russell diagram is:

50. a scatter graph of stars in which the absolute magnitude (intrinsic luminosity) of stars is plotted vertically against their surface temperature (or corresponding spectral types) Hertzsprung-Russell diagram is:

51. Hertzsprung-Russell diagram is:

52. Hertzsprung-Russell diagram is not:

53. Hertzsprung-Russell diagram is:

54. ABSOLUTE MAGNITUDE is:

55. a measure of the star's luminosity---the total amount of energy radiated by the star every second.

56. ABSOLUTE MAGNITUDE is:

57. ABSOLUTE MAGNITUDE is not:

58. APPARENT MAGNITUDE is: The apparent brightness of a star observed from the Earth

59. APPARENT MAGNITUDE is:

60. APPARENT MAGNITUDE is not:

61. APPARENT MAGNITUDE is: The apparent brightness of a star observed from the Earth

62. APPARENT MAGNITUDE is: the "what you see is what you get" magnitude

63. APPARENT MAGNITUDE is: The apparent brightness of a star observed from the Earth

64. APPARENT MAGNITUDE is:

65. Electromagnetic Spectrum is:

66. Electromagnetic Spectrum is: Full range of electromagnetic waves

67. Electromagnetic Spectrum is:

68. Electromagnetic Spectrum is not:

69. Electromagnetic Spectrum is:

70. TROUGH is: the lowest part of a wave; the part of a wave with the least magnitude.

71. TROUGH is:

72. TROUGH is not: Get out of my Trough!

73. TROUGH is: the lowest part of a wave; the part of a wave with the l east magnitude.

74. TROUGH is:

75. the lowest part of a wave; the part of a wave with the least magnitude.

76. TROUGH is:

77. CREST is:

78. the highest part of a wave; the part of a wave with th e greatest magnitude.

79. CREST is:

80. CREST is not:

81. CREST is:

82. WAVELENGTH is:

83. The distance between successive crests of a wave

84. WAVELENGTH is:

85. WAVELENGTH is not:

86. WAVELENGTH is:

87. FREQUENCY is:

88. the number of occurrences of a repeating event per unit time.

89. FREQUENCY is:

90. FREQUENCY is not:

91. FREQUENCY is:

92. NANOMETER is:

93. 1 billionth of a meter, written 10 ⁻⁹ m

94. NANOMETER is:

96. Hertz is: Measurement of wave frequency equal to vibrations per second.

97. Hertz is:

98. Spectrometer is: Used to measure the property of light