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Discovering the Universe

Physics & Astronomy

Quiz 17 :

Galaxies

Quiz 17 :

Galaxies

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A spiral galaxy is observed edge-on so that its spiral arms are barely visible. The galaxy, however, is observed to have a very large nuclear bulge. Thus, this galaxy
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A

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What is the classification for a spiral galaxy with a small nuclear region and loosely wound arms?
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Answer:

B

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A spiral galaxy is observed edge-on so that the spiral arms cannot be seen clearly. Is it possible to classify this into one of the Sa, Sb, and Sc categories?
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Answer:

B

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According to the Hubble classification scheme, an Sa galaxy has
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In a spiral galaxy, the
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In spiral galaxies, the tightness of the winding of the spiral arms appears to be related directly to the
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What is the classification for a spiral galaxy with a moderately sized nuclear region and moderately wound arms?
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An astronomer studying a distant cluster of galaxies finds that several of the galaxies are spiral-shaped, with a nuclear region of moderate size and moderately wound arms. How should the astronomer classify these galaxies?
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A particular galaxy appears round, with a nuclear region of uniform brightness and an outer region that is broken up into curved but fuzzy and poorly defined lanes of stars and light gas clouds. How would this galaxy be classified?
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What is the basic shape of a spiral galaxy?
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According to the Hubble classification scheme, an Sc galaxy has a(n)
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Suppose the Milky Way Galaxy is 1 of a 1000 billion galaxies and they similarly have, on average, 200 billion stars each. How many stars is that?
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What is the classification for a spiral galaxy with a large nuclear region and tightly wound arms?
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An astronomer studying a distant cluster of galaxies finds that several of the galaxies are spiral-shaped, with a large nuclear region and tightly wound arms. How should the astronomer classify these galaxies?
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What does a spiral galaxy look like when seen edge-on?
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A spiral galaxy has well-defined arms that are wound not-too-tightly around its intermediate-size bulge. This is MOST likely a
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Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa, Sb, and Sc. However, many spiral galaxies are aligned edge-on to Earth and their spiral arms cannot be seen. Which other parameter that is directly related to spiral-arm tightness can be easily seen edge-on and can therefore be used to provide this classification?
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An astronomer studying a distant cluster of galaxies finds that several of the galaxies are spiral-shaped, with a small nuclear region and loosely wound arms. How should the astronomer classify these galaxies?
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The Andromeda Galaxy (M31) is BEST described as a(n)
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What type of galaxy has a nuclear region of more or less uniform brightness from which long lanes of stars curve outward?
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