1. Galaxies Astrobiology and Cosmology
Practice Test

2. RQ #1
What is the relationship between the nucleus of a spiral galaxy and the spiral arms?

3. RQA#1
The larger the nucleus the tighter the spiral arms are to the nucleus

4. RQ#2
In irregular galaxies there are areas of red and blue stars. What does this observation mean about the stars in an irregular galaxy?

5. RQA#2
The stars formed at different times and are different ages

6. RQ#3
What will the classification of an almost perfect circular galaxy be according to the Hubble Tuning Fork classification model?

7. RQA#3 E0

8. RQ#4
If 2 galaxies like the Milky Way and Andromeda collide what will be the result?

9. RQA#4
The galaxies would merge into a larger galaxy

10. RQ#5
Where is the Earth located in the universe?

11. RQA#5
In the Milky Way galaxy

12. RQ#6
What is the common method of looking for an exoplanet?

13. RQA#6
By observing the changes in the light from the central stars

14. RQ#7
The habitable zone is the region where an exoplanet can support life. As a result of being in the habitable zone what would be thought to be a characteristic of the planet located there?

15. RQA#7
Water in liquid form

16. RQ#8
In looking for signs of life on an exoplanet, what do astronomers look for?

17. RQA#8
Spectral lines from the atmospheres if exoplanets that may contain oxygen, water, or carbon dioxide

18. RQ#9
In our own solar system where would the best candidates be for possible locations for life?

19. RQA#9
Enceledus, Europa, and Mars because of the possibly of water

20. RQ#10
True or False?
Astronomers have confirmed life on other planets.

21. RQA#10
False

22. RQ#11
List 2 pieces of evidence of the Big Bang?

23. RQA#11 Galaxies are moving away from each other
Cosmic background radiation is in all directions
A large percentage of the universe is hydrogen and helium

24. RQ#12
List 3 reasons why the Steady State Theory was abandoned.

25. RQA#12 The universe is expanding and changing
Background radiation is seen in all directions that can not be explained by a static universe
No new material is seen appearing in the universe to maintain a constant density

26. RQ#13
What is true about scientific theories?

27. RQA#13
Scientific theories are broad explanations for several well-tested observations

28. RQ#14
What is dark matter?

29. RQA#14
We do not know what dark matter is.

30. RQ#15
How do we know that dark matter exists?

31. RQA#15
By rotation rates of stars in a galaxy

32. RQ#16
What does Hubble Law state?

33. RQA#16 The universe is expanding The universe had a beginning
The universe was once more dense that it is now

34. RQ#17
True or False?
The Milky Way is the center of the universe.

35. RQA#17
False

36. RQ#18
Where did the Big Bang occur?

37. RQA#18
Everywhere-all around

38. RQ#19
The balloon model is a good analogy for what astrological theory?

39. RQA#19
The expanding universe

40. RQ#20
In the most recent investigation of a Type 1A supernova what have astronomers found out about the universe?

41. RQA#20
The universe will expand forever

42. RQ#21
What does the dark energy in the universe cause?

43. RQA#21
Acceleration of the expansion of the universe

44. RQ#22
According to Hubble’s Law, what is the velocity of a receding galaxy that is 500Mpc away?

45. RQA#22 V = Hd; H = 70km/s/Mpc (Hubble’s Constant)
500Mpc x 70 km/s/Mpc = 35,000 Km/sec

46. RQ#23
Where is the center of the universe?

47. RQA#23
Near Sgr A (Sagittarius A)

48. RQ#24
According to Hubble’s Law quasars that show red-shift and extremely high velocities indicate that the quasars are what?

49. RQA#24
The quasar is far away from us.

50. RQ#25
Why is the 21 cm emission line useful when studying the Milky Way galaxy?

51. RQA#25
The 21 cm radiation is not affected by interstellar dust

52. RQ#26
A bluish color of a nebula around the Pleiades is produced from what?

53. RQA#26
Starlight is reflected by interstellar grains

54. RQ#27
What causes a reflection nebula?

55. RQA#27
Dust particles

56. RQ#28
Why can we not see to the other side of our galaxy?

57. RQA#28
Interstellar dust

58. RQ#29
How many stars are there in the Milky Way galaxy?

59. RQA#29
100 to 200 billion

60. RQ#30
What type of galaxy is the Milky Way?

61. RQA#30
Spiral galaxy

62. RQ#31
What object do astronomers believe is at the center of the Milky Way?

63. RQA#31
Black Hole

64. RQ#32
In the following diagram which letter represents the location of Earth? A C B D

65. RQA#32 B

66. RQ#33
In the following diagram which letter represents the location of the globular clusters? A C B D

67. RQA#33 A

68. RQ#34
In the following diagram which letter represents the location of the Sun? A C B D

69. RQA#34 B

70. RQ#35
In the following diagram which letter represents the location of the galactic disk? A C B D

71. RQA#35 D

72. RQ#36
In the following diagram which letter represents the location of the galactic nucleus? A C B D

73. RQA#36 C

74. RQ#37
In a spiral galaxy, in what region are young stars forming and where do they exist?

75. RQA#37
Spiral Arms

76. RQ#38
Because elliptical galaxies contain redder stars and less dust this translates to describing the age of the galaxy as what?

77. RQA#38
Elliptical galaxies are relatively old galaxies

78. RQ#39
What classification system are used to classify galaxies?

79. RQA#39
Hubble classification by shape

80. RQ#40
What is cosmology?

81. RQA#40
How the universe was created and its present and future structures

82. RQ#41
List 3 things about the cosmic background radiation that is received on Earth.

83. RQA#41 Uniform in all directions Indicate temperatures of 2.7 Kelvin
Indicate left over radiation from the Big Bang

84. RQ#42
What type of EM light received from galaxies indicate that the universe is expanding?

85. RQA#42
Red-shifted light

86. RQ#43
What type of galaxy is the picture showing?

87. RQA#43
Elliptical

88. RQ#44
What type of galaxy is the picture showing?

89. RQA#44
Spiral

90. RQ#45
What type of galaxy is the picture showing?

91. RQA#45
Irregular

92. RQ#46
What type of galaxy is the picture showing?

93. RQA#46
Barred Spiral

94. RQ#47
How would the universe be described in the first microseconds after the Big Bang?

95. RQA#47
A hot soup of particles and energy

96. RQ#48
Look at the Hubble Law graph. What is the velocity of a galaxy that is located 120Mpc from the Earth?

97. RQA#48
~ 8500 km/s