Question 1

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

Accepted Answer

The answer of Almost all active galactic nuclei seem to...

Question 2

While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is

Accepted Answer

A)  moving away from us. 
B)  moving towards us. 
C)  expanding explosively. 
D)  blue shifted. 
E)  not forming new stars. 
A)  moving away from us. 
B)  moving towards us. 
C)  expanding explosively. 
D)  blue shifted. 
E)  not forming new stars.

Question 3

That quasars were at cosmological distances yet appeared like ordinary faint stars meant

Accepted Answer

A)  they were the brightest stars ever observed. 
B)  they must be very large. 
C)  they must contain many O and B type stars. 
D)  they must be producing such large quantities of energy than even fusion could not explain their output. 
E)  they must be very small, but bright due to gravitational lensing. 
A)  they were the brightest stars ever observed. 
B)  they must be very large. 
C)  they must contain many O and B type stars. 
D)  they must be producing such large quantities of energy than even fusion could not explain their output. 
E)  they must be very small, but bright due to gravitational lensing.

Question 4

Why does the Cepheid "standard candle" have limited usefulness beyond 100 Mpc?

Accepted Answer

A)  Distant galaxies are seen in the past, when Cepheid variables behaved differently than they do today. 
B)  Distant galaxies are so young they do not contain Cepheids. 
C)  Cepheids are too faint to be seen beyond that distance, even with HST. 
D)  The light variability of Cepheids diminishes with distance so they do not appear to vary there. 
E)  Older distant Cepheids are of population II, where the period-luminosity relation no longer works. 
A)  Distant galaxies are seen in the past, when Cepheid variables behaved differently than they do today. 
B)  Distant galaxies are so young they do not contain Cepheids. 
C)  Cepheids are too faint to be seen beyond that distance, even with HST. 
D)  The light variability of Cepheids diminishes with distance so they do not appear to vary there. 
E)  Older distant Cepheids are of population II, where the period-luminosity relation no longer works.

Question 5

The lobes of a radio galaxy can be as much as

Accepted Answer

A)  dozens of light-years from the galaxy's nucleus. 
B)  hundreds of light-years from the galaxy's nucleus. 
C)  thousands of light-years from the galaxy's nucleus. 
D)  millions of light-years from the galaxy's nucleus. 
E)  billions of light-years from the galaxy's nucleus. 
A)  dozens of light-years from the galaxy's nucleus. 
B)  hundreds of light-years from the galaxy's nucleus. 
C)  thousands of light-years from the galaxy's nucleus. 
D)  millions of light-years from the galaxy's nucleus. 
E)  billions of light-years from the galaxy's nucleus.

Question 6

For nearby spirals, their rotation curves help measure both light and dark matter.

Accepted Answer

A) True 
 B)False

Question 7

Giant elliptical galaxies may be the result of ________ in the centers of rich clusters.

Accepted Answer

galaxy mer

Question 8

According to Hubble's Law, the greater a galaxy's redshift, the

Accepted Answer

A)  closer it is to us. 
B)  younger it is. 
C)  faster it's approaching us. 
D)  farther it is from us. 
E)  greater its mass. 
A)  closer it is to us. 
B)  younger it is. 
C)  faster it's approaching us. 
D)  farther it is from us. 
E)  greater its mass.

Question 9

What is a standard candle?

Accepted Answer

A standard candle is an astron

Question 10

Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiate energy.

Accepted Answer

A)  globular clusters for food 
B)  a very strong magnetic field from neutron stars 
C)  a source of high-energy electrons for synchrotron radiation 
D)  an accretion disk of infalling matter 
E)  a high rate of rotation for the black hole 
A)  globular clusters for food 
B)  a very strong magnetic field from neutron stars 
C)  a source of high-energy electrons for synchrotron radiation 
D)  an accretion disk of infalling matter 
E)  a high rate of rotation for the black hole

Question 11

What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?

Accepted Answer

All active galaxies and quasars emit mas

Question 12

How did Hubble use the cosmological redshift to determine distance?

Accepted Answer

The redshift is caused by the Doppler ef

Question 13

Relate black holes in the early galaxies to quasars.

Accepted Answer

Star-produced black holes in young galax

Question 14

Why do we believe galaxy clusters are rich in dark matter?

Accepted Answer

Studies of the gravitational i

Question 15

The Milky Way Galaxy's galaxy type is SBb.

Accepted Answer

A) True 
 B)False

Question 16

Discuss the population, size, and types of galaxies we find in our Local Group.

Accepted Answer

With 45 members, the Local Group is abou

Question 17

Most galaxies in the Local Group are

Accepted Answer

A)  dwarf spirals. 
B)  small irregulars similar to the Magellanic Clouds. 
C)  larger spirals than either the Milky Way or M-31 in Andromeda. 
D)  dwarf ellipticals, similar to the companions of M-31. 
E)  brown dwarfs, with even more dust than our own Galaxy. 
A)  dwarf spirals. 
B)  small irregulars similar to the Magellanic Clouds. 
C)  larger spirals than either the Milky Way or M-31 in Andromeda. 
D)  dwarf ellipticals, similar to the companions of M-31. 
E)  brown dwarfs, with even more dust than our own Galaxy.

Question 18

Contrast the results of a collision between two spiral galaxies on their stars and their gas and dust clouds.

Accepted Answer

The stars are so spread out that collisi

Question 19

According to Hubble's Law, a galaxy with a velocity of 25,000 km/s will be

Accepted Answer

A)  100 million pcs away. 
B)  400 million pcs away. 
C)  700 million pcs away. 
D)  1000 million pcs away. 
E)  less than 1 million pcs away. 
A)  100 million pcs away. 
B)  400 million pcs away. 
C)  700 million pcs away. 
D)  1000 million pcs away. 
E)  less than 1 million pcs away.

Question 20

Astronomers observe unobscured X-rays generated in active galactic nuclei.

Accepted Answer

A) True 
 B)False

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is

That quasars were at cosmological distances yet appeared like ordinary faint stars meant

Why does the Cepheid "standard candle" have limited usefulness beyond 100 Mpc?

The lobes of a radio galaxy can be as much as

For nearby spirals, their rotation curves help measure both light and dark matter.

Giant elliptical galaxies may be the result of ________ in the centers of rich clusters.

According to Hubble's Law, the greater a galaxy's redshift, the

What is a standard candle?

Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiate energy.

What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?

How did Hubble use the cosmological redshift to determine distance?

Relate black holes in the early galaxies to quasars.

Why do we believe galaxy clusters are rich in dark matter?

The Milky Way Galaxy's galaxy type is SBb.

Discuss the population, size, and types of galaxies we find in our Local Group.

Most galaxies in the Local Group are

Contrast the results of a collision between two spiral galaxies on their stars and their gas and dust clouds.

According to Hubble's Law, a galaxy with a velocity of 25,000 km/s will be

Astronomers observe unobscured X-rays generated in active galactic nuclei.

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Measuring the Stars

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Cosmology and the Universe

Filters

Exam 14: Galaxies

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is

That quasars were at cosmological distances yet appeared like ordinary faint stars meant

Why does the Cepheid "standard candle" have limited usefulness beyond 100 Mpc?

The lobes of a radio galaxy can be as much as

For nearby spirals, their rotation curves help measure both light and dark matter.

Giant elliptical galaxies may be the result of ________ in the centers of rich clusters.

According to Hubble's Law, the greater a galaxy's redshift, the

What is a standard candle?

Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiate energy.

What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?

How did Hubble use the cosmological redshift to determine distance?

Relate black holes in the early galaxies to quasars.

Why do we believe galaxy clusters are rich in dark matter?

The Milky Way Galaxy's galaxy type is SBb.

Discuss the population, size, and types of galaxies we find in our Local Group.

Most galaxies in the Local Group are

Contrast the results of a collision between two spiral galaxies on their stars and their gas and dust clouds.

According to Hubble's Law, a galaxy with a velocity of 25,000 km/s will be

Astronomers observe unobscured X-rays generated in active galactic nuclei.

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Measuring the Stars

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Cosmology and the Universe

Filters