Question 1

The energy source at the center of our galaxy

Accepted Answer

A)  is not visible at optical wavelengths. 
B)  produces gamma rays. 
C)  must be less than 10 AU in diameter. 
D)  all of the above 
E)  none of the above 
A)  is not visible at optical wavelengths. 
B)  produces gamma rays. 
C)  must be less than 10 AU in diameter. 
D)  all of the above 
E)  none of the above D

Question 2

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter?

Accepted Answer

A)  Small velocities are seen at large distances from the galactic center. 
B)  Small velocities are seen at distances close to the galactic center. 
C)  Large velocities are seen at large distances from the galactic center. 
D)  Large velocities are seen at distances close to the galactic center. 
A)  Small velocities are seen at large distances from the galactic center. 
B)  Small velocities are seen at distances close to the galactic center. 
C)  Large velocities are seen at large distances from the galactic center. 
D)  Large velocities are seen at distances close to the galactic center. C

Question 3

Which of the following is not a characteristic of the stars of the disk component of our galaxy?

Accepted Answer

A)  circular orbits 
B)  randomly inclined orbits 
C)  higher metal abundance 
D)  young stars 
E)  star formation regions 
A)  circular orbits 
B)  randomly inclined orbits 
C)  higher metal abundance 
D)  young stars 
E)  star formation regions B

Question 4

Spiral tracers tend to be old,luminous stars.

Accepted Answer

A) True 
 B)False

Question 5

Giant molecular cloud complexes are located in spiral arms.

Accepted Answer

A) True 
 B)False

Question 6

If a star with a peculiar space motion with respect a typical disk star is found what other property would you expect it to have?

Accepted Answer

A)  Low luminosity. 
B)  Poor metal content compared to the Sun. 
C)  Old age. 
D)  All of the above. 
A)  Low luminosity. 
B)  Poor metal content compared to the Sun. 
C)  Old age. 
D)  All of the above.

Question 7

Nucleosynthesis

Accepted Answer

A)  is the process by which energy is produced at the center of the galaxy. 
B)  is the process by which hydrogen and helium are converted into heavier elements. 
C)  describes the structure of a globular cluster. 
D)  describes how the magnetic field of the galaxy traps cosmic rays. 
E)  describes the method by which neutral hydrogen produces 21 cm radiation. 
A)  is the process by which energy is produced at the center of the galaxy. 
B)  is the process by which hydrogen and helium are converted into heavier elements. 
C)  describes the structure of a globular cluster. 
D)  describes how the magnetic field of the galaxy traps cosmic rays. 
E)  describes the method by which neutral hydrogen produces 21 cm radiation.

Question 8

CO observations of the galaxy reveal

Accepted Answer

A)  the location of dense neutral hydrogen clouds. 
B)  the location of population II stars. 
C)  the location of population I stars. 
D)  the location of the galactic corona. 
E)  the location of giant molecular clouds. 
A)  the location of dense neutral hydrogen clouds. 
B)  the location of population II stars. 
C)  the location of population I stars. 
D)  the location of the galactic corona. 
E)  the location of giant molecular clouds.

Question 9

Galaxy spiral arms are traced out (outlined)by stars which are

Accepted Answer

A)  I & III 
B)  I & IV 
C)  II & III 
D)  II & IV 
E)  I,III,& IV 
A)  I & III 
B)  I & IV 
C)  II & III 
D)  II & IV 
E)  I,III,& IV

Question 10

This is a "thought" question.Why are few galaxies outside our own galaxy seen in the circle around the sky where the Milky Way is located? This is because ...

Accepted Answer

A)  there aren't any galaxies in those directions 
B)  dust in the Milky Way blots out our view of galaxies in those directions 
C)  the missing mass is in those directions 
D)  the Big Bang has blown galaxies away from those directions 
A)  there aren't any galaxies in those directions 
B)  dust in the Milky Way blots out our view of galaxies in those directions 
C)  the missing mass is in those directions 
D)  the Big Bang has blown galaxies away from those directions

Question 11

____________________ are groups of 100,000 to 1,000,000 population II stars firmly bound by gravity.

Accepted Answer

The answer of ____________________ are groups of 100,000 to 1,000,000...

Question 12

The center of our galaxy shows signs of past eruptions.

Accepted Answer

A) True 
 B)False

Question 13

Population II stars

Accepted Answer

A)  III & IV 
B)  I & II 
C)  II 
D)  IV 
E)  I,II,& III 
A)  III & IV 
B)  I & II 
C)  II 
D)  IV 
E)  I,II,& III

Question 14

How does the traditional monolithic collapse theory of the formation of the galaxy explain the origin of globular clusters?

Accepted Answer

A)  They formed in the disk and later were ejected to the halo. 
B)  They formed in other galaxies and were captured by close interactions. 
C)  They build over time from the collision of stars in the halo. 
D)  They formed early on during the free-fall collapse of the proto-galactic material. 
A)  They formed in the disk and later were ejected to the halo. 
B)  They formed in other galaxies and were captured by close interactions. 
C)  They build over time from the collision of stars in the halo. 
D)  They formed early on during the free-fall collapse of the proto-galactic material.

Question 15

The energy source at the center of our galaxy is called

Accepted Answer

A)  Cygnus X-1. 
B)  the Orion arm. 
C)  the sun. 
D)  Sagittarius A*. 
A)  Cygnus X-1. 
B)  the Orion arm. 
C)  the sun. 
D)  Sagittarius A*.

Question 16

The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought.

Accepted Answer

A) True 
 B)False

Question 17

The traditional monolithic collapse theory for the formation of the Milky Way Galaxy suggests that our galaxy formed

Accepted Answer

A)  as material accreted around a massive black hole currently at the center of our galaxy. 
B)  from a large cloud of material that formed stars and star clusters and slowly flattened to a disk. 
C)  from material that had been ejected in the violent explosion of a dying galaxy. 
D)  as a result of mergers between several smaller groups of gas,dust,and stars. 
E)  as two massive galaxies collided. 
A)  as material accreted around a massive black hole currently at the center of our galaxy. 
B)  from a large cloud of material that formed stars and star clusters and slowly flattened to a disk. 
C)  from material that had been ejected in the violent explosion of a dying galaxy. 
D)  as a result of mergers between several smaller groups of gas,dust,and stars. 
E)  as two massive galaxies collided.

Question 18

The nuclear bulge of our galaxy

Accepted Answer

A)  contains stars that are primarily population I stars. 
B)  contains relatively large amounts of gas and dust. 
C)  contains stars primarily associated with the spherical component of our galaxy. 
D)  contains stars primarily associated with the disk component of our galaxy. 
E)  a,b,and d 
A)  contains stars that are primarily population I stars. 
B)  contains relatively large amounts of gas and dust. 
C)  contains stars primarily associated with the spherical component of our galaxy. 
D)  contains stars primarily associated with the disk component of our galaxy. 
E)  a,b,and d

Question 19

The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy.

Accepted Answer

The answer of The rotation curve of the galaxy provides...

Question 20

Our galaxy is suspected to be surrounded by a galactic corona because the disk of the galaxy

Accepted Answer

A)  rotates faster than expected in its outer region. 
B)  rotates more slowly than expected in its outer region. 
C)  rotates faster than expected in its inner region. 
D)  rotates more slowly than expected in its inner region. 
E)  is much flatter than expected. 
A)  rotates faster than expected in its outer region. 
B)  rotates more slowly than expected in its outer region. 
C)  rotates faster than expected in its inner region. 
D)  rotates more slowly than expected in its inner region. 
E)  is much flatter than expected.

Exam 15: The Milky Way Galaxy

The energy source at the center of our galaxy

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter?

Which of the following is not a characteristic of the stars of the disk component of our galaxy?

Spiral tracers tend to be old,luminous stars.

Giant molecular cloud complexes are located in spiral arms.

If a star with a peculiar space motion with respect a typical disk star is found what other property would you expect it to have?

Nucleosynthesis

CO observations of the galaxy reveal

Galaxy spiral arms are traced out (outlined)by stars which are

This is a "thought" question.Why are few galaxies outside our own galaxy seen in the circle around the sky where the Milky Way is located? This is because ...

____________________ are groups of 100,000 to 1,000,000 population II stars firmly bound by gravity.

The center of our galaxy shows signs of past eruptions.

Population II stars

How does the traditional monolithic collapse theory of the formation of the galaxy explain the origin of globular clusters?

The energy source at the center of our galaxy is called

The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought.

The traditional monolithic collapse theory for the formation of the Milky Way Galaxy suggests that our galaxy formed

The nuclear bulge of our galaxy

The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy.

Our galaxy is suspected to be surrounded by a galactic corona because the disk of the galaxy

Here and Now

A Users Guide to the Sky

Cycles of the Moon

The Origin of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

The Formation and Structure of Stars

Stellar Evolution

The Deaths of Stars

Neutron Stars and Black Holes

Galaxies

Active Galaxies and Supermassive Black Holes

Modern Cosmology

The Origin of the Solar System

Earth: the Standard of Comparative Planetology

The Moon and Mercury: Comparing Airless Worlds

Venus and Mars

Jupiter and Saturn

Uranus,neptune,and the Kuiper Belt

Meteorites,asteroids,and Comets

Astrobiology: Life on Other Worlds

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