Question 1

The negative velocity numbers in the above graph represent a galaxy that is moving away from us.

Accepted Answer

A) True 
 B)False

Question 2

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

Accepted Answer

​ 
Measurements show that the stars near

Question 3

What type of galaxies do astronomers believe to be the most common?

Accepted Answer

A)  elliptical 
B)  spiral 
C)  irregular 
D)  Astronomers have no idea which type of galaxy is most common. 
A)  elliptical 
B)  spiral 
C)  irregular 
D)  Astronomers have no idea which type of galaxy is most common.

Question 4

If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately

Accepted Answer

A)  2170 Mpc. 
B)  2030 Mpc. 
C)  30 Mpc. 
D)  0.03 Mpc. 
E)  147,000 Mpc. 
A)  2170 Mpc. 
B)  2030 Mpc. 
C)  30 Mpc. 
D)  0.03 Mpc. 
E)  147,000 Mpc.

Question 5

From nearest to furthest from Earth, list the distance indicators and which type of object is best found at that distant indicator.

Accepted Answer

Radar ranging (Figure 6-9) is good for l

Question 6

If the redshift of a quasar were 3, at what wavelength would the 486.1-nm line of hydrogen appear in the quasar's spectrum?

Accepted Answer

The answer of If the redshift of a quasar were...

Question 7

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?

Accepted Answer

​ 
High-energy jets appear to be the res

Question 8

The red line shown above is shifted 15.8% from the blue dashed line. If H β  is 486.1 nm, what is the change in the wavelength?

Accepted Answer

A)  562.9 nm 
B)  76.8 nm 
C)  486.1 nm 
D)  409.3 nm 
A)  562.9 nm 
B)  76.8 nm 
C)  486.1 nm 
D)  409.3 nm

Question 9

Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by Earth's atmospheric "seeing". Despite the blurring, it was realized that the intense energy-emitting regions of quasars must be small because they

Accepted Answer

A)  have high radial velocities. 
B)  are very luminous. 
C)  are surrounded by quasar fuzz. 
D)  radiate huge amounts of energy. 
E)  fluctuate rapidly on time scales as short as a few hours. 
A)  have high radial velocities. 
B)  are very luminous. 
C)  are surrounded by quasar fuzz. 
D)  radiate huge amounts of energy. 
E)  fluctuate rapidly on time scales as short as a few hours.

Question 10

The energy from an AGN is produced by

Accepted Answer

A)  the collision of two spiral galaxies. 
B)  the collision of two elliptical galaxies. 
C)  the collision of two radio jets. 
D)  matter flowing into a supermassive black hole. 
E)  supernovae. 
A)  the collision of two spiral galaxies. 
B)  the collision of two elliptical galaxies. 
C)  the collision of two radio jets. 
D)  matter flowing into a supermassive black hole. 
E)  supernovae.

Question 11

Quasars are most common with redshifts

Accepted Answer

A)  less than 0.1 
B)  less than 0.5 
C)  of about 2 
D)  greater than 6 
E)  greater than 8 
A)  less than 0.1 
B)  less than 0.5 
C)  of about 2 
D)  greater than 6 
E)  greater than 8

Question 12

The above visual wavelength image of spectra (right panel) taken from a spiral galaxy (left panel) shows an emission line that is__________ on the side that is rotating away and an emission line that is ___________ on the side that is rotating towards us.

Accepted Answer

A)  redshifted, redshifted 
B)  blueshifted, blueshifted 
C)  redshifted, blueshifted 
D)  blueshifted, redshifted 
A)  redshifted, redshifted 
B)  blueshifted, blueshifted 
C)  redshifted, blueshifted 
D)  blueshifted, redshifted

Question 13

How are astronomers able to determine that quasars are so small?

Accepted Answer

A)  They are variable over a short period of time. 
B)  They emit mainly X-rays. 
C)  They are only found at very large distance. 
D)  The structure of a quasar is completely resolved in images. 
A)  They are variable over a short period of time. 
B)  They emit mainly X-rays. 
C)  They are only found at very large distance. 
D)  The structure of a quasar is completely resolved in images.

Question 14

__________ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center.

Accepted Answer

A)  The Hubble constant 
B)  A galaxy's color 
C)  A galaxy's rotation curve 
D)  A galaxy's diameter 
E)  The velocity dispersion method 
A)  The Hubble constant 
B)  A galaxy's color 
C)  A galaxy's rotation curve 
D)  A galaxy's diameter 
E)  The velocity dispersion method

Question 15

The above visual wavelength image suggests that star formation is currently occurring.

Accepted Answer

A) True 
 B)False

Question 16

If H equals 50 km/s/Mpc, then a galaxy with a radial velocity of 50,000 km/s will have a distance of about 1 Mpc.

Accepted Answer

A) True 
 B)False

Question 17

The Virgo cluster

Accepted Answer

A)  is the galactic cluster that contains the Milky Way. 
B)  is the oldest known cluster of galaxies. 
C)  is located at the center of the universe. 
D)  contains mostly spiral galaxies and very few elliptical galaxies. 
E)  is a rich cluster and the closest cluster of galaxies outside of the Local Group. 
A)  is the galactic cluster that contains the Milky Way. 
B)  is the oldest known cluster of galaxies. 
C)  is located at the center of the universe. 
D)  contains mostly spiral galaxies and very few elliptical galaxies. 
E)  is a rich cluster and the closest cluster of galaxies outside of the Local Group.

Question 18

If a quasar has a redshift of 0.98, then it is receding from Earth at 98 percent the speed of light.

Accepted Answer

A) True 
 B)False

Question 19

Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter.

Accepted Answer

A)  5 
B)  25 
C)  35 
D)  45 
E)  90 
A)  5 
B)  25 
C)  35 
D)  45 
E)  90

Question 20

All __________ galaxies are spiral galaxies that have small, luminous nuclei.

Accepted Answer

A)  active 
B)  radio 
C)  Seyfert 
D)  double-lobed radio 
E)  blazar 
A)  active 
B)  radio 
C)  Seyfert 
D)  double-lobed radio 
E)  blazar

The negative velocity numbers in the above graph represent a galaxy that is moving away from us.

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

What type of galaxies do astronomers believe to be the most common?

If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately

From nearest to furthest from Earth, list the distance indicators and which type of object is best found at that distant indicator.

If the redshift of a quasar were 3, at what wavelength would the 486.1-nm line of hydrogen appear in the quasar's spectrum?

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?

The red line shown above is shifted 15.8% from the blue dashed line. If H_β is 486.1 nm, what is the change in the wavelength?

Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by Earth's atmospheric "seeing". Despite the blurring, it was realized that the intense energy-emitting regions of quasars must be small because they

The energy from an AGN is produced by

Quasars are most common with redshifts

The above visual wavelength image of spectra (right panel) taken from a spiral galaxy (left panel) shows an emission line that is on the side that is rotating away and an emission line that is _ on the side that is rotating towards us.

How are astronomers able to determine that quasars are so small?

__________ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center.

The above visual wavelength image suggests that star formation is currently occurring.

If H equals 50 km/s/Mpc, then a galaxy with a radial velocity of 50,000 km/s will have a distance of about 1 Mpc.

The Virgo cluster

If a quasar has a redshift of 0.98, then it is receding from Earth at 98 percent the speed of light.

Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter.

All __________ galaxies are spiral galaxies that have small, luminous nuclei.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 13: Galaxies: Normal and Active

The negative velocity numbers in the above graph represent a galaxy that is moving away from us.

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

What type of galaxies do astronomers believe to be the most common?

If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately

From nearest to furthest from Earth, list the distance indicators and which type of object is best found at that distant indicator.

If the redshift of a quasar were 3, at what wavelength would the 486.1-nm line of hydrogen appear in the quasar's spectrum?

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?

The red line shown above is shifted 15.8% from the blue dashed line. If H β is 486.1 nm, what is the change in the wavelength?

Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by Earth's atmospheric "seeing". Despite the blurring, it was realized that the intense energy-emitting regions of quasars must be small because they

The energy from an AGN is produced by

Quasars are most common with redshifts

The above visual wavelength image of spectra (right panel) taken from a spiral galaxy (left panel) shows an emission line that is__________ on the side that is rotating away and an emission line that is ___________ on the side that is rotating towards us.

How are astronomers able to determine that quasars are so small?

__________ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center.

The above visual wavelength image suggests that star formation is currently occurring.

If H equals 50 km/s/Mpc, then a galaxy with a radial velocity of 50,000 km/s will have a distance of about 1 Mpc.

The Virgo cluster

If a quasar has a redshift of 0.98, then it is receding from Earth at 98 percent the speed of light.

Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter.

All __________ galaxies are spiral galaxies that have small, luminous nuclei.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

The red line shown above is shifted 15.8% from the blue dashed line. If H_β is 486.1 nm, what is the change in the wavelength?

The above visual wavelength image of spectra (right panel) taken from a spiral galaxy (left panel) shows an emission line that is on the side that is rotating away and an emission line that is _ on the side that is rotating towards us.