Question 1

What type of galaxy is this?

Accepted Answer

A)  a giant elliptical 
B)  a regular spiral galaxy 
C)  an irregular galaxy 
D)  a barred spiral 
E)  a dwarf elliptical 
A)  a giant elliptical 
B)  a regular spiral galaxy 
C)  an irregular galaxy 
D)  a barred spiral 
E)  a dwarf elliptical

Question 2

What is the difference between a Seyfert galaxy and a normal spiral galaxy?

Accepted Answer

A Seyfert galaxy contains a lu

Question 3

If the radio lobes of a radio galaxy extend out to 10 Mpc from the center of the galaxy and the particles in them are traveling at approximately 0.99 c, then how long must the black hole at the center have been ejecting this material into space? Note that 1 Mpc = 3.1 *1022 m and 1 year= 3 *107 s.

Accepted Answer

Because @#LAT-DLM& = d/t, the length of time the b

Question 4

Which of the following are NOT found mainly in the spiral arms of galaxies?

Accepted Answer

A)  molecular clouds 
B)  H II regions 
C)  K- and M-type stars 
D)  Type II supernovae 
E)  O-type stars 
A)  molecular clouds 
B)  H II regions 
C)  K- and M-type stars 
D)  Type II supernovae 
E)  O-type stars

Question 5

Dark matter is distributed inside galaxies in exactly the same way as luminous matter, although the total mass of dark matter is much larger than that of luminous matter.

Accepted Answer

A) True 
 B)False

Question 6

How do the current star formation rates of spiral and elliptical galaxies compare?

Accepted Answer

Spirals contain lots of cold gas in thei

Question 7

The Hubble classification scheme for galaxies sorts them by:

Accepted Answer

A)  their evolutionary state 
B)  their mass 
C)  the amount of dust 
D)  the amount of dark matter 
E)  their visual appearance 
A)  their evolutionary state 
B)  their mass 
C)  the amount of dust 
D)  the amount of dark matter 
E)  their visual appearance

Question 8

A galaxy rotation curve is a plot of the rotation speed as a function of the:

Accepted Answer

A)  galaxy's luminosity 
B)  mass of the dark matter halo 
C)  brightness of the luminous matter in the galaxy 
D)  radius from the center 
E)  ages of star clusters 
A)  galaxy's luminosity 
B)  mass of the dark matter halo 
C)  brightness of the luminous matter in the galaxy 
D)  radius from the center 
E)  ages of star clusters

Question 9

The unified model of AGN suggests that quasars, Seyfert galaxies, and radio galaxies:

Accepted Answer

A)  are unrelated, although they are all very luminous galaxies at radio wavelengths 
B)  are powered by similar mass accretion rates onto supermassive black holes 
C)  are driven by violent mergers of two gas-rich spiral galaxies 
D)  are similar phenomena but viewed from different orientation angles 
E)  are all powered by high rates of star formation and supernova explosions 
A)  are unrelated, although they are all very luminous galaxies at radio wavelengths 
B)  are powered by similar mass accretion rates onto supermassive black holes 
C)  are driven by violent mergers of two gas-rich spiral galaxies 
D)  are similar phenomena but viewed from different orientation angles 
E)  are all powered by high rates of star formation and supernova explosions

Question 10

Describe two ways by which spiral structure may be induced in a spiral galaxy's disk.

Accepted Answer

Possibilities are:
(1) gravitational int

Question 11

Dark matter is most likely made up of:

Accepted Answer

A)  elementary particles that have mass but do not interact much with normal matter 
B)  supermassive black holes 
C)  faint stellar remnants such as white dwarfs and neutron stars 
D)  free-floating Jupiter-mass planets 
E)  cold concentrations of dust 
A)  elementary particles that have mass but do not interact much with normal matter 
B)  supermassive black holes 
C)  faint stellar remnants such as white dwarfs and neutron stars 
D)  free-floating Jupiter-mass planets 
E)  cold concentrations of dust

Question 12

We can determine the three-dimensional shape of any individual elliptical galaxy by photographing it.

Accepted Answer

A) True 
 B)False

Question 13

What type of galaxy is this?

Accepted Answer

A)  a giant elliptical 
B)  an ordinary spiral galaxy 
C)  an irregular galaxy 
D)  a barred spiral 
E)  a dwarf elliptical 
A)  a giant elliptical 
B)  an ordinary spiral galaxy 
C)  an irregular galaxy 
D)  a barred spiral 
E)  a dwarf elliptical

Question 14

The disks of spiral galaxies appear blue because:

Accepted Answer

A)  they are moving toward us 
B)  they contain a relatively high concentration of low-mass stars 
C)  they contain active regions of star formation 
D)  they contain more metals that, when ionized, emit blue light 
E)  stars collide with each other frequently in these dense regions and explode as Type I supernovae 
A)  they are moving toward us 
B)  they contain a relatively high concentration of low-mass stars 
C)  they contain active regions of star formation 
D)  they contain more metals that, when ionized, emit blue light 
E)  stars collide with each other frequently in these dense regions and explode as Type I supernovae

Question 15

Outside the dark matter halo of a galaxy, how should the speed of an orbiting body such as a satellite dwarf galaxy depend on its distance from the giant galaxy's center?

Accepted Answer

When you are outside the giant galaxy's

Question 16

Seyfert galaxies are unique because they have large lobes of radio emission that extend well beyond the visible part of the galaxy.

Accepted Answer

A) True 
 B)False

Question 17

If the average quasar has a luminosity of 1014 L $\odot$  and an absolute magnitude of -30, and you discover one that has an apparent magnitude of +10, then what is its distance?

Accepted Answer

A)  10,000 Mpc 
B)  5,000 Mpc 
C)  1,000 Mpc 
D)  500 Mpc 
E)  0.1 Mpc 
A)  10,000 Mpc 
B)  5,000 Mpc 
C)  1,000 Mpc 
D)  500 Mpc 
E)  0.1 Mpc

Question 18

Stars in the disks of spiral galaxies have orbits that:

Accepted Answer

A)  are randomly oriented 
B)  constantly are getting larger 
C)  mostly aligned in the same plane 
D)  spiral shaped 
E)  unaffected by dark matter 
A)  are randomly oriented 
B)  constantly are getting larger 
C)  mostly aligned in the same plane 
D)  spiral shaped 
E)  unaffected by dark matter

Question 19

How do we know that many E galaxies contain significant amounts of dark matter?

Accepted Answer

Many E galaxies are observed to contain

Question 20

Quasars were first discovered in which region of the electromagnetic spectrum?

Accepted Answer

A)  X-ray 
B)  gamma-ray 
C)  radio 
D)  infrared 
E)  visible 
A)  X-ray 
B)  gamma-ray 
C)  radio 
D)  infrared 
E)  visible

Exam 20: Galaxies

What type of galaxy is this?

What is the difference between a Seyfert galaxy and a normal spiral galaxy?

If the radio lobes of a radio galaxy extend out to 10 Mpc from the center of the galaxy and the particles in them are traveling at approximately 0.99 c, then how long must the black hole at the center have been ejecting this material into space? Note that 1 Mpc = 3.1 *1022 m and 1 year= 3 *107 s.

Which of the following are NOT found mainly in the spiral arms of galaxies?

Dark matter is distributed inside galaxies in exactly the same way as luminous matter, although the total mass of dark matter is much larger than that of luminous matter.

How do the current star formation rates of spiral and elliptical galaxies compare?

The Hubble classification scheme for galaxies sorts them by:

A galaxy rotation curve is a plot of the rotation speed as a function of the:

The unified model of AGN suggests that quasars, Seyfert galaxies, and radio galaxies:

Describe two ways by which spiral structure may be induced in a spiral galaxy's disk.

Dark matter is most likely made up of:

We can determine the three-dimensional shape of any individual elliptical galaxy by photographing it.

What type of galaxy is this?

The disks of spiral galaxies appear blue because:

Outside the dark matter halo of a galaxy, how should the speed of an orbiting body such as a satellite dwarf galaxy depend on its distance from the giant galaxy's center?

Seyfert galaxies are unique because they have large lobes of radio emission that extend well beyond the visible part of the galaxy.

If the average quasar has a luminosity of 1014 L ⊙\odot⊙ and an absolute magnitude of -30, and you discover one that has an apparent magnitude of +10, then what is its distance?

Stars in the disks of spiral galaxies have orbits that:

How do we know that many E galaxies contain significant amounts of dark matter?

Quasars were first discovered in which region of the electromagnetic spectrum?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

If the radio lobes of a radio galaxy extend out to 10 Mpc from the center of the galaxy and the particles in them are traveling at approximately 0.99 c, then how long must the black hole at the center have been ejecting this material into space? Note that 1 Mpc = 3.1 10²² m and 1 year= 3 10⁷ s.

If the average quasar has a luminosity of 10¹⁴ L _$\odot$ and an absolute magnitude of -30, and you discover one that has an apparent magnitude of +10, then what is its distance?