61. Where do you expect to find an O type star? A. In the halo of a spiral galax
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Question
61. Where do you expect to find an O type star?
A. In the halo of a spiral galaxy
B. Near the center of a small elliptical galaxy
C. On the disk of a large elliptical galaxy
D. On the spiral arms of a spiral galaxy
E. Equally likely in a spiral or elliptical galaxy
62. Which type of galaxy typically contains the least relative amount of gas and dust?
A. The spiral
B. The elliptical
C. The irregular
D. They all contain the same proportion.
63. Which type of galaxy often contains the largest relative amount of gas and dust?
A. The spiral
B. The elliptical
C. The irregular
D. They all contain about the same fraction.
64. Which of the following would explain the fact that elliptical galaxies contain mostly old stars?
A. Most of their gas is at low temperature.
B. Elliptical galaxies lack cool interstellar matter to form stars.
C. All the young stars are in dark molecular clouds, therefore invisible.
D. Most of the star-forming material in elliptical galaxies exists in the form of dark matter.
65. Which type of galaxy can have the largest mass?
A. A spiral galaxy
B. An elliptical galaxy
C. An irregular galaxy
D. An S0 galaxy
66. The majority of galaxies in our immediate vicinity (i.e., in the local group) are:
A. Large spiral galaxies.
B. Large elliptical galaxies.
C. Small spiral galaxies.
D. Irregular and small elliptical galaxies.
E. All kinds are equally likely.
Theres a fair amount of points in this section - don't blow them off- you can do it, or at least try, what are you
afraid of?
67.- 69. What evidence exists for the presence of a supermassive black hole at the center of our galaxy?
70. - 72. Give a possible explanation for the fact that galaxies with active nuclei are only located billions of
light-years from us.
73.-75. Assuming that there was a tenth "planet" (yes, Pluto is no longer a "planet" but according to Bode's law
it is ) out beyond Pluto, that none-the-less could be predicted using Bode's Law (SHOW ALL WORK! Anyone
can do this!) Don't forget Kepler's third law!
a) how far would it be from the Sun? (you only need Bode's law for this)
b) what would its orbital period be? (Kepler's third law needed here)
76. - 80. Planet X is discovered circling a star 50 lt-yrs away from us. Analysis of the giant planet's radius and
mass, show them to be 1 x 10^10 centimeters (cm), (that's ten to the tenth power - 10,000,000,000 - ten
billion cm), and 6 x 10^27 grams a) What is the density of the giant planet ? (50% of the credit) density =
mass/volume = 6 x 10^27/4.2 x10^27 = 1.4 g/cc b) would it be like a gas giant a terrestrial planet or what?
81. - 82. How long does it take sunlight to reach Pluto? (The inside front cover of your text has the distance)
Show all work or no credit!
83. - 85. Calculate the density of Charon given the information on problem 8 p. 284. Show all work. What
formulas would you need? To begin with, you'd want to calculate the volume - how? Then what?
Explanation / Answer
The Milky Way is the galaxy that contains our Solar System.[11][12][13][nb 1] This name derives from its appearance as a dim "milky" glowing band arching across the night sky, in which the naked eye cannot distinguish individual stars. The term "Milky Way" is a translation of the Classical Latin via lactea, from the Hellenistic Greek ???????? ?????? (pr. galax
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