Question 1

The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by

Accepted Answer

A) using Hubble's law. 
B) measuring Doppler shifts of different parts of the disk. 
C) the steady state theory. 
D) measuring Doppler shifts of different parts of the disk. 
A) using Hubble's law. 
B) measuring Doppler shifts of different parts of the disk. 
C) the steady state theory. 
D) measuring Doppler shifts of different parts of the disk.

Question 2

The Hubble law is a relation between a galaxy's

Accepted Answer

A) mass and its luminosity. 
B) distance and its luminosity. 
C) mass and its recession velocity. 
D) distance and its recession velocity. 
E) mass and its diameter. 
A) mass and its luminosity. 
B) distance and its luminosity. 
C) mass and its recession velocity. 
D) distance and its recession velocity. 
E) mass and its diameter.

Question 3

The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________.

Accepted Answer

A) luminosity 
B) distance 
C) mass 
D) diameter 
E) age 
A) luminosity 
B) distance 
C) mass 
D) diameter 
E) age

Question 4

If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth

Accepted Answer

A) Galaxy A is four times closer than Galaxy B. 
B) Galaxy A is four times further away than Galaxy B. 
C) Galaxy A is twice as distant than Galaxy B. 
D) Galaxy A is twice as close than Galaxy B. 
A) Galaxy A is four times closer than Galaxy B. 
B) Galaxy A is four times further away than Galaxy B. 
C) Galaxy A is twice as distant than Galaxy B. 
D) Galaxy A is twice as close than Galaxy B.

Question 5

Active galaxies are thought to have _______ in their centers.

Accepted Answer

A) accretion disks 
B) massive black holes 
C) accretion disks and massive black holes 
D) the Local Group 
E) a cluster of galaxies 
A) accretion disks 
B) massive black holes 
C) accretion disks and massive black holes 
D) the Local Group 
E) a cluster of galaxies

Question 6

Where jets run into surrounding gas in the intergalactic medium, ____________ are formed before feeding the lobes.

Accepted Answer

The answer of Where jets run into surrounding gas in...

Question 7

If Hubble's constant is taken to be 70 km/s/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar

Accepted Answer

A) 4100 Mpc 
B) 0.014 Mpc 
C) 67 Mpc 
D) 74 Mpc 
E) 300,000 Mpc 
A) 4100 Mpc 
B) 0.014 Mpc 
C) 67 Mpc 
D) 74 Mpc 
E) 300,000 Mpc

Question 8

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

Accepted Answer

A) Doppler shifts of material at the edge of its disk and computing P = 2πr/v. 
B) the distances of the Doppler shift points from its center. 
C) Doppler shifts of material at the edge of its disk and computing P = 2πr/v and the distances of the Doppler shift points from its center. 
D) It is impossible to estimate the mass of M31. 
A) Doppler shifts of material at the edge of its disk and computing P = 2πr/v. 
B) the distances of the Doppler shift points from its center. 
C) Doppler shifts of material at the edge of its disk and computing P = 2πr/v and the distances of the Doppler shift points from its center. 
D) It is impossible to estimate the mass of M31.

Question 9

-The graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating __________ us whereas from 10 to 30 kpc, the spiral galaxy is rotating __________ from us.

Accepted Answer

A) toward, away 
B) away, away 
C) toward, toward 
D) away, toward 
A) toward, away 
B) away, away 
C) toward, toward 
D) away, toward

Question 10

Hypothesize what kind of galaxy would result from two similar-mass interacting spiral galaxies and two similar- mass interacting elliptical galaxies.

Accepted Answer

Two interacting spirals may en

Question 11

What of the following distance methods is used to determine the distance to the most distant galaxies

Accepted Answer

A) radar echo 
B) supernova observations 
C) period-luminosity relationship of variable stars 
D) parallax 
A) radar echo 
B) supernova observations 
C) period-luminosity relationship of variable stars 
D) parallax

Question 12

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 13

What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured

Accepted Answer

A) Hubble's law 
B) supernova observations 
C) period-luminosity relationship of variable stars 
D) parallax 
A) Hubble's law 
B) supernova observations 
C) period-luminosity relationship of variable stars 
D) parallax

Question 14

Why is the number of galaxies in the Local Group uncertain

Accepted Answer

The total number of galaxies i

Question 15

Active galaxy radio lobes and jets contain magnetic fields.

Accepted Answer

A) True 
 B)False

Question 16

For a galaxy to be active, the supermassive black hole needs to have matter flow into it.

Accepted Answer

A) True 
 B)False

Question 17

How does the rotation curve method differ from the analysis of binary stars

Accepted Answer

Although there are a few ways to estimat

Question 18

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 19

The unified model describes active galactic nuclei using

Accepted Answer

A) a supermassive black hole at the center of a normal spiral galaxy. 
B) a supermassive black hole surrounded by an accretion disk and dense disk of gas. 
C) an accretion disk around a neutron star. 
D) gravitational lenses to intensify the radiation coming from them. 
E) different lines of sight toward and dwarf irregular galaxy. 
A) a supermassive black hole at the center of a normal spiral galaxy. 
B) a supermassive black hole surrounded by an accretion disk and dense disk of gas. 
C) an accretion disk around a neutron star. 
D) gravitational lenses to intensify the radiation coming from them. 
E) different lines of sight toward and dwarf irregular galaxy.

Question 20

Supermassive black holes are believed to be located at the center of many galaxies because

Accepted Answer

A) the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter. 
B) the orbital motion of material near the center is very fast and indicates a very massive core. 
C) the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole. 
D) the spiral structure requires a black hole to maintain the spiral arms. 
E) the orbital speeds of a globular clusters in the galaxy are greater than the speed of light. 
A) the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter. 
B) the orbital motion of material near the center is very fast and indicates a very massive core. 
C) the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole. 
D) the spiral structure requires a black hole to maintain the spiral arms. 
E) the orbital speeds of a globular clusters in the galaxy are greater than the speed of light.

The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by

The Hubble law is a relation between a galaxy's

The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________.

If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth

Active galaxies are thought to have _______ in their centers.

Where jets run into surrounding gas in the intergalactic medium, ____________ are formed before feeding the lobes.

If Hubble's constant is taken to be 70 km/s/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

-The graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating us whereas from 10 to 30 kpc, the spiral galaxy is rotating from us.

Hypothesize what kind of galaxy would result from two similar-mass interacting spiral galaxies and two similar- mass interacting elliptical galaxies.

What of the following distance methods is used to determine the distance to the most distant galaxies

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

What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured

Why is the number of galaxies in the Local Group uncertain

Active galaxy radio lobes and jets contain magnetic fields.

For a galaxy to be active, the supermassive black hole needs to have matter flow into it.

How does the rotation curve method differ from the analysis of binary stars

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 unified model describes active galactic nuclei using

Supermassive black holes are believed to be located at the center of many galaxies because

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

The Origin of the Solar System

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 Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by

The Hubble law is a relation between a galaxy's

The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________.

If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth

Active galaxies are thought to have _______ in their centers.

Where jets run into surrounding gas in the intergalactic medium, ____________ are formed before feeding the lobes.

If Hubble's constant is taken to be 70 km/s/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

-The graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating __________ us whereas from 10 to 30 kpc, the spiral galaxy is rotating __________ from us.

Hypothesize what kind of galaxy would result from two similar-mass interacting spiral galaxies and two similar- mass interacting elliptical galaxies.

What of the following distance methods is used to determine the distance to the most distant galaxies

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

What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured

Why is the number of galaxies in the Local Group uncertain

Active galaxy radio lobes and jets contain magnetic fields.

For a galaxy to be active, the supermassive black hole needs to have matter flow into it.

How does the rotation curve method differ from the analysis of binary stars

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 unified model describes active galactic nuclei using

Supermassive black holes are believed to be located at the center of many galaxies because

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

The Origin of the Solar System

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 graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating us whereas from 10 to 30 kpc, the spiral galaxy is rotating from us.