Question 1

A galaxy that has gone through many collisions and mergers must be a(n) _______________ galaxy.

Accepted Answer

The answer of A galaxy that has gone through many...

Question 2

Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____.

Accepted Answer

A)  angular diameter 
B)  mass 
C)  orbital speed 
D)  age 
E)  recession velocity 
A)  angular diameter 
B)  mass 
C)  orbital speed 
D)  age 
E)  recession velocity

Question 3

Is dark matter important in other galaxies and galactic clusters?

Accepted Answer

Dark matter is very common and

Question 4

A galaxy with randomly oriented elongated star orbits and little gas and dust would be a(n)  _______________ galaxy.

Accepted Answer

The answer of A galaxy with randomly oriented elongated star...

Question 5

Cepheids and globular clusters are limited in their ability to measure the distance to galaxies because they ____.

Accepted Answer

A)  are too rare 
B)  are not bright enough to detect at large distances 
C)  behave differently in other galaxies than they do in our own 
D)  do not appear in dwarf galaxies 
E)  are only found in elliptical galaxies 
A)  are too rare 
B)  are not bright enough to detect at large distances 
C)  behave differently in other galaxies than they do in our own 
D)  do not appear in dwarf galaxies 
E)  are only found in elliptical galaxies

Question 6

In order to calculate the size and luminosity of a galaxy, you must first determine its ____.

Accepted Answer

A)  age 
B)  mass 
C)  shape 
D)  metallicity 
E)  distance 
A)  age 
B)  mass 
C)  shape 
D)  metallicity 
E)  distance

Question 7

Globular clusters can be used to measure the distance of nearby galaxies.

Accepted Answer

A) True 
 B)False

Question 8

Discuss two ways of detecting dark matter in distant galaxies and clusters.

Accepted Answer

The luminosity of a galaxy is proportion

Question 9

Giant spirals are the largest galaxies in the Universe.

Accepted Answer

A) True 
 B)False

Question 10

Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy with a recession velocity of 21,000 km/s must be _______________ Mpc from Earth. (Express your answer as a whole number of Mpc)

Accepted Answer

The answer of Because the Hubble constant has a value...

Question 11

Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 50 Mpc away would have a recession velocity of _______________ km/s. (Round your answer to the nearest 1 km/s).

Accepted Answer

The answer of Because the Hubble constant has a value...

Question 12

The mass of a galaxy can be determined from its _______________ curve.

Accepted Answer

The answer of The mass of a galaxy can be...

Question 13

All elliptical galaxies are more massive than the largest spiral galaxies.

Accepted Answer

A) True 
 B)False

Question 14

At the longest look-back times, we see ____.

Accepted Answer

A)  redshifted irregular galaxies 
B)  redshifted dwarf elliptical galaxies 
C)  redshifted dwarf spiral galaxies 
D)  blueshifted dwarf spiral galaxies 
E)  blueshifted dwarf elliptical galaxies 
A)  redshifted irregular galaxies 
B)  redshifted dwarf elliptical galaxies 
C)  redshifted dwarf spiral galaxies 
D)  blueshifted dwarf spiral galaxies 
E)  blueshifted dwarf elliptical galaxies

Question 15

The mass of a galaxy's central black hole is proportional to the mass of its _______________.

Accepted Answer

bulge,cent

Question 16

Hubble's Law is only effective in measuring the distance to nearby galaxies.

Accepted Answer

A) True 
 B)False

Question 17

Galaxies contain 10 times as much dark matter as visible matter.

Accepted Answer

A) True 
 B)False

Question 18

Rich galactic clusters ____.

Accepted Answer

A)  are rare, because galaxies are usually isolated in space 
B)  contain gas that is rich in metals 
C)  are composed of mostly elliptical galaxies 
D)  are very spread out, without a defined center 
E)  contain a wide variety of galaxy types and sizes 
A)  are rare, because galaxies are usually isolated in space 
B)  contain gas that is rich in metals 
C)  are composed of mostly elliptical galaxies 
D)  are very spread out, without a defined center 
E)  contain a wide variety of galaxy types and sizes

Question 19

How are standard candles used to measure distance?

Accepted Answer

A standard candle is an object

Question 20

The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____.

Accepted Answer

A)  the measured mass is about ten times the estimated mass, due to the effects of the central black hole 
B)  the measured mass is approximately equal to the estimated mass 
C)  there is no clear relationship between the estimated and measured mass 
D)  the measured mass is about ten times the estimated mass, due to the effects of dark matter 
E)  the estimated mass is about ten times the measured mass, due to the effects of dark matter 
A)  the measured mass is about ten times the estimated mass, due to the effects of the central black hole 
B)  the measured mass is approximately equal to the estimated mass 
C)  there is no clear relationship between the estimated and measured mass 
D)  the measured mass is about ten times the estimated mass, due to the effects of dark matter 
E)  the estimated mass is about ten times the measured mass, due to the effects of dark matter

Exam 16: Galaxies

A galaxy that has gone through many collisions and mergers must be a(n) _______________ galaxy.

Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____.

Is dark matter important in other galaxies and galactic clusters?

A galaxy with randomly oriented elongated star orbits and little gas and dust would be a(n) _______________ galaxy.

Cepheids and globular clusters are limited in their ability to measure the distance to galaxies because they ____.

In order to calculate the size and luminosity of a galaxy, you must first determine its ____.

Globular clusters can be used to measure the distance of nearby galaxies.

Discuss two ways of detecting dark matter in distant galaxies and clusters.

Giant spirals are the largest galaxies in the Universe.

Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy with a recession velocity of 21,000 km/s must be _______________ Mpc from Earth. (Express your answer as a whole number of Mpc)

Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 50 Mpc away would have a recession velocity of _______________ km/s. (Round your answer to the nearest 1 km/s).

The mass of a galaxy can be determined from its _______________ curve.

All elliptical galaxies are more massive than the largest spiral galaxies.

At the longest look-back times, we see ____.

The mass of a galaxy's central black hole is proportional to the mass of its _______________.

Hubble's Law is only effective in measuring the distance to nearby galaxies.

Galaxies contain 10 times as much dark matter as visible matter.

Rich galactic clusters ____.

How are standard candles used to measure distance?

The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

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The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

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Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

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