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The Essential Cosmic Perspective Study Set 1

Physics & Astronomy

Quiz 15 :

Our Galaxy

Quiz 15 :

Our Galaxy

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What is an ionization nebula?
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Multiple Choice
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Answer:

D

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Where does most star formation occur in the Milky Way Galaxy?
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Answer:

A

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How can we see through the interstellar medium?
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Answer:

B

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What kinds of objects lie in the disk of our galaxy?
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How do high- mass stars make it more difficult for a molecular cloud to form more stars?
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The galactic center lies in the direction of which constellation?
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What evidence suggests that the protogalactic cloud that formed the Milky Way resulted from several collisions among smaller clouds?
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What kinds of objects lie in the halo of our galaxy?
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Most nearby stars move relative to the Sun at speeds below about 30 km/s. Suppose you observe a nearby star that is moving much faster than this (say, 300 km/s). Which of the following is a likely explanation for its high speed?
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How does the interstellar medium obscure our view of most of the galaxy?
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Most stars in the Milky Way's halo are .
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Suppose you want to observe and study the radiation from gas inside an interstellar bubble created by a supernova. Which of the following observatories will be most useful?
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The image of our galaxy in radio emission from carbon monoxide maps the distribution of molecular clouds. Which of the following would give a similar picture of our galaxy?
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On a dark summer night in the northern hemisphere, we can see the Milky Way, but we can't see the center of the Milky Way. Why not?
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Why has star formation ceased in the galactic halo?
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Which kind of star is highly unlikely to be found in the halo of the Milky Way?
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Over time, what is the net effect of the star- gas- star cycle in the Milky Way?
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What elements do astronomers consider heavy elements?
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Where do most dust grains form?
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The very first stars in the universe were made of
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