Question 1

The orbits of halo and bulge 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 disc around a black hole.F) A) and B)
G) A) and C)

Question 2

Density waves may explain

Accepted Answer

A)   the lack of blue stars in the halo.
B)   the random orbits of halo stars.
C)   the density of red stars in the bulge.
D)   the spiral arm structure of the Galaxy.
E)   the large number of open clusters in the halo.F) C) and D)
G) A) and D)

Question 3

In our vicinity, the Galactic disk is about 100 times wider than it is thick.

Accepted Answer

A) True 
 B)False

Question 4

The location of the Galactic center was first found by Harlow Shapley with

Accepted Answer

A)   radio emissions from Sagittarius A.
B)   Cepheids of population I in the spiral arms.
C)   RR Lyrae variables in the globular clusters.
D)   planetary nebulae in the open clusters.
E)   infrared observations of the heat from its accretion disk around the black hole.F) A) and E)
G) A) and D)

Question 5

From the Sun, the distance to the Galactic center is about

Accepted Answer

A)   8 pc.
B)   8,000 pc.
C)   100,000 pc.
D)   225 million pc.
E)   100 billion pc.F) B) and D)
G) A) and B)

Question 6

Harlow Shapley found the Milky Way was

Accepted Answer

A)   centered on the Earth.
B)   much smaller than previously thought.
C)   rapidly expanding.
D)   much larger than previously thought.
E)   uniformly spherical in shape.F) D) and E)
G) A) and C)

Question 7

The infall of material in the Galactic halo to the Galactic disk stopped shortly after the formation of globular clusters.

Accepted Answer

A) True 
 B)False

Question 8

Stars in the Galactic disk came billions of years before stars in the Galactic halo.

Accepted Answer

A) True 
 B)False

Question 9

Which of these is NOT typical of the Galaxy's spiral arms?

Accepted Answer

A)   Hot, young blue stars
B)   Emission nebulae like M42
C)   O and B stars
D)   Open clusters
E)   Old giant stars like orange ArcturusF) D) and E)
G) All of the above

Question 10

The leading explanation for the existence of spiral arms is

Accepted Answer

A)   shock waves from cyclic supernovae explosions.
B)   shock wave from the quasar-like eruption of the Galactic core.
C)   passages of spiral density waves through the interstellar medium.
D)   passages of massive globular clusters through the Galactic plane.
E)   tidal streams of small galaxies being torn up by our monster Galaxy.F) A) and D)
G) A) and C)

Question 11

Galactic disks appear blue because

Accepted Answer

A)   they contain no G, K, or M dwarfs.
B)   they contain only blue reflection nebulae.
C)   dust obscures the longer, red, wavelengths.
D)   O and B blue giants are much brighter than G, K, or M dwarfs.
E)   dark matter gravitationally shifts all wavelengths towards the blue.F) A) and C)
G) C) and D)

Question 12

In structure, our Milky Way is most similar to

Accepted Answer

A)   the Large Magellanic Cloud.
B)   an upscale version of a globular cluster.
C)   M-31, the Andromeda Galaxy.
D)   the Orion nebula.
E)   none of these.F) B) and E)
G) A) and B)

Question 13

Of what is the Galactic halo presumed to be composed? What evidence supports this conclusion?

Accepted Answer

The globular clusters are most obvious, ...

Question 14

Which sequence of formation by age is correct, oldest to youngest?

Accepted Answer

A)   Dark nebulae, planetary nebulae, emission nebulae
B)   Spiral arms, bulge, halo
C)   Halo, spiral arms, globular clusters
D)   Globular clusters, emission nebulae, open clustersE) B) and D)
F) B) and C)

Question 15

Who was Henrietta Leavitt, and what did she do to help map the universe?

Accepted Answer

This Harvard astronomer found the period...

Question 16

Who discovered the period-luminosity relationship, and why was it so critical?

Accepted Answer

Henrietta Leavitt discovered the period-...

Question 17

The period-luminosity relation for Cepheid variables was discovered in 1908 by

Accepted Answer

A)   William Herschel.
B)   Henrietta Leavitt.
C)   Harlow Shapley.
D)   Heber Curtiss.
E)   Edwin Hubble.F) None of the above
G) C) and D)

Question 18

Our Milky Way Galaxy is now known to be quite similar to the nearby Andromeda Galaxy, M-31.

Accepted Answer

A) True 
 B)False

Question 19

Our solar system is in the Galactic ________ of the Milky Way Galaxy.

Accepted Answer

The answer of Our solar system is in the Galactic...

Question 20

Star formation ceased first in the

Accepted Answer

A)   nucleus.
B)   spiral arms.
C)   bulge.
D)   halo.
E)   Galactic disk.F) D) and E)
G) A) and C)

Exam 13: The Milky Way Galaxy

The infall of material in the Galactic halo to the Galactic disk stopped shortly after the formation of globular clusters.

Correct AnswerverifiedShow Answer

Who discovered the period-luminosity relationship, and why was it so critical?

Correct AnswerverifiedHenrietta Leavitt discovered the period-...View AnswerShow Answer

Stars in the Galactic disk came billions of years before stars in the Galactic halo.

Correct AnswerverifiedShow Answer

Which sequence of formation by age is correct, oldest to youngest?

Correct AnswerverifiedShow Answer

Who was Henrietta Leavitt, and what did she do to help map the universe?

Correct AnswerverifiedThis Harvard astronomer found the period...View AnswerShow Answer

The leading explanation for the existence of spiral arms is

Correct AnswerverifiedShow Answer

Which of these is NOT typical of the Galaxy's spiral arms?

Correct AnswerverifiedShow Answer

Density waves may explain

Correct AnswerverifiedShow Answer

Of what is the Galactic halo presumed to be composed? What evidence supports this conclusion?

Correct AnswerverifiedThe globular clusters are most obvious, ...View AnswerShow Answer

Galactic disks appear blue because

Correct AnswerverifiedShow Answer

Star formation ceased first in the

Correct AnswerverifiedShow Answer

Harlow Shapley found the Milky Way was

Correct AnswerverifiedShow Answer

In our vicinity, the Galactic disk is about 100 times wider than it is thick.

Correct AnswerverifiedShow Answer

Our solar system is in the Galactic ________ of the Milky Way Galaxy.

Correct AnswerverifiedShow Answer

Our Milky Way Galaxy is now known to be quite similar to the nearby Andromeda Galaxy, M-31.

Correct AnswerverifiedShow Answer

In structure, our Milky Way is most similar to

Correct AnswerverifiedShow Answer

The orbits of halo and bulge stars have been compared to

Correct AnswerverifiedShow Answer

From the Sun, the distance to the Galactic center is about

Correct AnswerverifiedShow Answer

The period-luminosity relation for Cepheid variables was discovered in 1908 by

Correct AnswerverifiedShow Answer

The location of the Galactic center was first found by Harlow Shapley with

Correct AnswerverifiedShow Answer

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Henrietta Leavitt discovered the period-...
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This Harvard astronomer found the period...
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The globular clusters are most obvious, ...
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