Question 1

What do the orbits of Populations I and II stars tell us about the formation of the Milky Way?

Accepted Answer

Older Population II stars move in comet-...

Question 2

In the halo,we do NOT find:

Accepted Answer

A)   tidal streams.
B)   globular clusters.
C)   small satellite galaxies.
D)   spiral arms.
E)   old white dwarfs.F) A) and E)
G) B) and C)

Question 3

Which of these objects have NOT been found in the Galactic Halo?

Accepted Answer

A)   RR Lyrae variables
B)   planetary nebulae
C)   emission nebulae
D)   Population II stars
E)   globular clustersF) A) and C)
G) None of the above

Question 4

The Earth lies close to the center of the Galaxy.

Accepted Answer

A) True 
 B)False

Question 5

The orbits of Population II stars have been compared to:

Accepted Answer

A)   planets around the Sun.
B)   satellites around planets.
C)   comets around the Sun.
D)   binary stars.
E)   the accretion disk around a black hole.F) B) and D)
G) A) and C)

Question 6

In age,Population I stars are typically much ________ than those of Population II.

Accepted Answer

The answer of In age,Population I stars are typically much...

Question 7

The interstellar ________ absorbs light from stars and makes them appear fainter and redder than they otherwise would appear.

Accepted Answer

The answer of The interstellar ________ absorbs light from stars...

Question 8

Describe our location in the Milky Way.

Accepted Answer

We lie in a spiral arm about 30,000 ly (8 kpc)out from the galactic center,and in the disk of the galaxy.

Question 9

As Curtiss thought,our Milky Way is now known to be quite similar to the nearby Andromeda Galaxy,M-31.

Accepted Answer

A) True 
 B)False

Question 10

The region on the H-R diagram where pulsating variables occur is called the:

Accepted Answer

A)   period-luminosity relation.
B)   mass-luminosity relation.
C)   instability strip.
D)   horizontal branch.
E)   main sequence appendix.F) B) and E)
G) None of the above C

Question 11

A pulsating variable star with a period of 10 days would be a Cepheid.

Accepted Answer

A) True 
 B)False

Question 12

Using an orbit size of 8 kpc,and a period of 225 million years,the mass of our Galaxy is found to be closest to:

Accepted Answer

A)   10⁶ solar masses.
B)   10⁸ solar masses.
C)   10¹⁰ solar masses.
D)   10¹¹ solar masses.
E)   10¹² solar masses.F) A) and E)
G) B) and C) D

Question 13

Why is visible light a bad choice for studying the core of the Galaxy? What is better?

Accepted Answer

Dust in the galactic plane blocks our vi...

Question 14

Shapley found that globular clusters are only found in the Galactic bulge.

Accepted Answer

A) True 
 B)False

Question 15

Henrietta Leavitt first showed the relationship between the mass and luminosity of Cepheids and their period of pulsation; the brighter,the longer this period.

Accepted Answer

A) True 
 B)False

Question 16

These objects are no longer considered a good explanation for the dark matter in the halo.

Accepted Answer

A)   WIMPs
B)   MACHOs
C)   black holes
D)   clouds of cool, neutral hydrogen
E)   brown dwarfsF) D) and E)
G) A) and C)

Question 17

The major problem faced by optical astronomers in trying to deduce the structure of the Milky Way Galaxy is that we can see only a small part of it because of the ________.

Accepted Answer

The answer of The major problem faced by optical astronomers...

Question 18

Which is the correct description of the Sun's location within the Milky Way?

Accepted Answer

A)   at the outer edge of the galactic bulge but in the plane of the disk
B)   in the disk but at its outer edge
C)   as Herschel found, very close to the Galactic center
D)   above the disk and about one-third of the galactic radius from the center
E)   in the disk and about one-half a galactic radius from the centerF) C) and E)
G) A) and B)

Question 19

List at least one naked-eye observation that is consistent with the ancient idea that Earth is at the center of the Milky Way.List at least one naked-eye observation that is inconsistent with the notion that Earth is at the center of the Milky Way.

Accepted Answer

The actual center of the galaxy is hidde...

Question 20

The temperature of the innermost part of the spinning gas near our galaxy's central black hole is:

Accepted Answer

A)   2.7 K.
B)   300 K.
C)   10,000 K.
D)   over 1,000,000 K.
E)   varying rapidly from 300 K to 1,000,000 K.F) B) and D)
G) A) and D)

Exam 23: The Milky Way Galaxy: A Spiral in Space

What do the orbits of Populations I and II stars tell us about the formation of the Milky Way?

Correct AnswerverifiedOlder Population II stars move in comet-...View AnswerShow Answer

In the halo,we do NOT find:

Correct AnswerverifiedShow Answer

Which of these objects have NOT been found in the Galactic Halo?

Correct AnswerverifiedShow Answer

The Earth lies close to the center of the Galaxy.

Correct AnswerverifiedShow Answer

The orbits of Population II stars have been compared to:

Correct AnswerverifiedShow Answer

In age,Population I stars are typically much ________ than those of Population II.

Correct AnswerverifiedShow Answer

The interstellar ________ absorbs light from stars and makes them appear fainter and redder than they otherwise would appear.

Correct AnswerverifiedShow Answer

Describe our location in the Milky Way.

Correct AnswerverifiedWe lie in a spiral arm about 30,000 ly (8 kpc)out from the galactic center,and in the disk of the galaxy.

As Curtiss thought,our Milky Way is now known to be quite similar to the nearby Andromeda Galaxy,M-31.

Correct AnswerverifiedShow Answer

The region on the H-R diagram where pulsating variables occur is called the:

Correct AnswerverifiedC

A pulsating variable star with a period of 10 days would be a Cepheid.

Correct AnswerverifiedShow Answer

Using an orbit size of 8 kpc,and a period of 225 million years,the mass of our Galaxy is found to be closest to:

Correct AnswerverifiedD

Why is visible light a bad choice for studying the core of the Galaxy? What is better?

Correct AnswerverifiedDust in the galactic plane blocks our vi...View AnswerShow Answer

Shapley found that globular clusters are only found in the Galactic bulge.

Correct AnswerverifiedShow Answer

Henrietta Leavitt first showed the relationship between the mass and luminosity of Cepheids and their period of pulsation; the brighter,the longer this period.

Correct AnswerverifiedShow Answer

These objects are no longer considered a good explanation for the dark matter in the halo.

Correct AnswerverifiedShow Answer

The major problem faced by optical astronomers in trying to deduce the structure of the Milky Way Galaxy is that we can see only a small part of it because of the ________.

Correct AnswerverifiedShow Answer

Which is the correct description of the Sun's location within the Milky Way?

Correct AnswerverifiedShow Answer

List at least one naked-eye observation that is consistent with the ancient idea that Earth is at the center of the Milky Way.List at least one naked-eye observation that is inconsistent with the notion that Earth is at the center of the Milky Way.

Correct AnswerverifiedThe actual center of the galaxy is hidde...View AnswerShow Answer

The temperature of the innermost part of the spinning gas near our galaxy's central black hole is:

Correct AnswerverifiedShow Answer

Correct Answer
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Older Population II stars move in comet-...
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We lie in a spiral arm about 30,000 ly (8 kpc)out from the galactic center,and in the disk of the galaxy.

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C

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D

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Dust in the galactic plane blocks our vi...
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The actual center of the galaxy is hidde...
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Correct Answer
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