Question 1

What observations suggest the mass of the Galaxy goes much farther out than its visible disc?

Accepted Answer

A)   21 cm maps of the spiral arms
B)   the rotation curve of the outermost portions of the disc
C)   the orbits of the open clusters in the disc
D)   infrared observations of distant brown dwarfs
E)   X-ray images of other galaxies' discs from ChandraF) C) and E)
G) D) and E)

Question 2

The part of the Milky Way we are most familiar with is the:

Accepted Answer

A)   Corona.
B)   Galactic Disk.
C)   Halo.
D)   Galactic Bulge.
E)   Galactic Center.F) C) and E)
G) A) and B)

Question 3

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 clusters
E)   Population I stars, Population II stars, Population III starsF) C) and D)
G) A) and B)

Question 4

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

Accepted Answer

A)   hot, young blue Population I stars
B)   emission nebulae like M42
C)   O and B stars
D)   open clusters
E)   Population II giants like orange ArcturusF) A) and C)
G) All of the above

Question 5

While yet unproven,the proposed WIMPS would be:

Accepted Answer

A)   massive like neutrons, but more elusive than neutrinos.
B)   made of only strong magnetic fields.
C)   rapidly decaying due to the weak nuclear force.
D)   changing charges and polarities too rapidly to pin down.
E)   the basic building blocks of neutrons and protons.F) C) and E)
G) All of the above

Question 6

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

Accepted Answer

Henrietta Leavitt discovered the period-...

Question 7

Why were globular clusters so vital to Harlow Shapley's success?

Accepted Answer

Globular clusters lie in the H...

Question 8

The rotation curve for our Galaxy shows stars beyond the Sun moving slower than expected.

Accepted Answer

A) True 
 B)False

Question 9

Star formation ceased first in the:

Accepted Answer

A)   nucleus.
B)   spiral arms.
C)   bulge.
D)   halo.
E)   galactic disk.F) A) and D)
G) All of the above

Question 10

Motions of objects near our Galaxy's core suggest the central black hole is about 3.7 billion solar masses.

Accepted Answer

A) True 
 B)False

Question 11

What features of the telescopic view of the Andromeda Galaxy,M-31,are also visible to the naked eye for our similar Galaxy?

Accepted Answer

In Andromeda,we see a tilted disk of sta...

Question 12

A star in the instability strip of the H-R diagram would:

Accepted Answer

A)   vary in both temperature and radius.
B)   explode as a type I supernova.
C)   vary in temperature and brightness, but not in radius.
D)   vary in brightness with an irregular pattern.
E)   vary in temperature and radius, but not in brightness.F) B) and D)
G) B) and C)

Question 13

Population I stars came billions of years before Population II stars.

Accepted Answer

A) True 
 B)False

Question 14

The spiral structure of the Milky Way is best revealed by ________ cm radio observations of HI regions.

Accepted Answer

The answer of The spiral structure of the Milky Way...

Question 15

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) A) and C)
G) A) and B)

Question 16

Why do we believe there is dark matter?

Accepted Answer

When we use the Keplerian equation to de...

Question 17

In the formation of our Galaxy,the ________ formed first.

Accepted Answer

A)   galactic disk
B)   galactic center
C)   globular clusters
D)   planetary nebulae
E)   spiral armsF) A) and D)
G) D) and E)

Question 18

We can estimate the mass of the Galaxy from observations of its ________ curve.

Accepted Answer

The answer of We can estimate the mass of the...

Question 19

Why is a variable star so convenient for measuring distances to very remote objects?

Accepted Answer

Certain types of variable stars,such as ...

Question 20

The instability strip includes many main sequence stars.

Accepted Answer

A) True 
 B)False

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

The instability strip includes many main sequence stars.

Correct AnswerverifiedShow Answer

Why do we believe there is dark matter?

Correct AnswerverifiedWhen we use the Keplerian equation to de...View AnswerShow Answer

What observations suggest the mass of the Galaxy goes much farther out than its visible disc?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The spiral structure of the Milky Way is best revealed by ________ cm radio observations of HI regions.

Correct AnswerverifiedShow Answer

Population I stars came billions of years before Population II stars.

Correct AnswerverifiedShow Answer

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

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

What features of the telescopic view of the Andromeda Galaxy,M-31,are also visible to the naked eye for our similar Galaxy?

Correct AnswerverifiedIn Andromeda,we see a tilted disk of sta...View AnswerShow Answer

Motions of objects near our Galaxy's core suggest the central black hole is about 3.7 billion solar masses.

Correct AnswerverifiedShow Answer

In the formation of our Galaxy,the ________ formed first.

Correct AnswerverifiedShow Answer

A star in the instability strip of the H-R diagram would:

Correct AnswerverifiedShow Answer

Why is a variable star so convenient for measuring distances to very remote objects?

Correct AnswerverifiedCertain types of variable stars,such as ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Why were globular clusters so vital to Harlow Shapley's success?

Correct AnswerverifiedGlobular clusters lie in the H...View AnswerShow Answer

The rotation curve for our Galaxy shows stars beyond the Sun moving slower than expected.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Star formation ceased first in the:

Correct AnswerverifiedShow Answer

We can estimate the mass of the Galaxy from observations of its ________ curve.

Correct AnswerverifiedShow Answer

The part of the Milky Way we are most familiar with is the:

Correct AnswerverifiedShow Answer

While yet unproven,the proposed WIMPS would be:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
When we use the Keplerian equation to de...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Henrietta Leavitt discovered the period-...
View Answer

Correct Answer
verified
In Andromeda,we see a tilted disk of sta...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Certain types of variable stars,such as ...
View Answer

Correct Answer
verified

Correct Answer
verified
Globular clusters lie in the H...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified