Question 1

Starburst galaxies

Accepted Answer

A)  contain a large number of very young stars, but very little evidence of gas clouds. 
B)  contain a large number of very old stars and almost no gas or dust. 
C)  are often associated with a galaxy that is colliding with another galaxy. 
D)  are common in rich clusters. 
E)  are composed of filaments and voids. 
A)  contain a large number of very young stars, but very little evidence of gas clouds. 
B)  contain a large number of very old stars and almost no gas or dust. 
C)  are often associated with a galaxy that is colliding with another galaxy. 
D)  are common in rich clusters. 
E)  are composed of filaments and voids.

Question 2

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.

Question 3

A megaparsec is equivalent to

Accepted Answer

A)  3.26 light-years. 
B)  206,265 AU. 
C)  the age of our solar system. 
D)  a million parsecs. 
E)  the diameter of the Milky Way galaxy. 
A)  3.26 light-years. 
B)  206,265 AU. 
C)  the age of our solar system. 
D)  a million parsecs. 
E)  the diameter of the Milky Way galaxy.

Question 4

Poor clusters of galaxies often contain an excess of E and S0 galaxies.

Accepted Answer

A) True 
 B)False

Question 5

_________________ galaxies are very luminous at X-ray and ultraviolet wavelengths and have broad emission lines in their spectra.

Accepted Answer

The answer of _________________ galaxies are very luminous at X-ray...

Question 6

___________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.

Accepted Answer

A)  Irregular 
B)  S0 
C)  E7 
D)  Sa 
E)  E0 
A)  Irregular 
B)  S0 
C)  E7 
D)  Sa 
E)  E0

Question 7

If the above shown spiral galaxy is 150 million ly away, how fast is it receding?

Accepted Answer

A)  32 km/s 
B)  320 km/s 
C)  3220 km/s 
D)  -320 km/s 
A)  32 km/s 
B)  320 km/s 
C)  3220 km/s 
D)  -320 km/s

Question 8

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 9

Which kind of active galaxies has been observed at the greatest distances from us?

Accepted Answer

A)  Seyfert galaxies 
B)  radio galaxies 
C)  quasars 
A)  Seyfert galaxies 
B)  radio galaxies 
C)  quasars

Question 10

The letters AGN stand for

Accepted Answer

A)  three spectral types of stars. 
B)  active planet. 
C)  active star. 
D)  active galaxy nucleus. 
E)  None of the other choices are correct. 
A)  three spectral types of stars. 
B)  active planet. 
C)  active star. 
D)  active galaxy nucleus. 
E)  None of the other choices are correct.

Question 11

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 12

What is the Hubble constant essentially a measure of?

Accepted Answer

A)  the number of galaxies in the universe 
B)  the expansion of the universe 
C)  the age of the Milky Way galaxy 
D)  the amount of dark matter in an average galaxy 
A)  the number of galaxies in the universe 
B)  the expansion of the universe 
C)  the age of the Milky Way galaxy 
D)  the amount of dark matter in an average galaxy

Question 13

The hot spots in a double-lobed radio source

Accepted Answer

A)  appear to coincide with the location of the central galaxy responsible for the jets. 
B)  are where hot excited gas interacts with the intergalactic medium. 
C)  are only found near quasars. 
D)  produce enough visible energy to be imaged at visible wavelengths. 
E)  are always perpendicular to each other. 
A)  appear to coincide with the location of the central galaxy responsible for the jets. 
B)  are where hot excited gas interacts with the intergalactic medium. 
C)  are only found near quasars. 
D)  produce enough visible energy to be imaged at visible wavelengths. 
E)  are always perpendicular to each other.

Question 14

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 15

Differences among AGNs as viewed from different inclination angles is known as a ________________.

Accepted Answer

The answer of Differences among AGNs as viewed from different...

Question 16

If the absolute magnitude, M , of a supernova is − 19 and a galaxy is found that contains a supernova with an apparent magnitude, m , of 16. What is the distance to the galaxy? Hint: d pc = 10( m - M + 5)/5

Accepted Answer

A)  100 AU 
B)  100 pc 
C)  100 ly 
D)  100 kpc 
E)  100 Mpc 
A)  100 AU 
B)  100 pc 
C)  100 ly 
D)  100 kpc 
E)  100 Mpc

Question 17

The look-back time is

Accepted Answer

A)  the time it takes for the light from an object to reach Earth. 
B)  numerically equal to the distance in light-years. 
C)  smaller for more distant objects. 
D)  All of the other choices are correct. 
E)  the time it takes for the light from an object to reach Earth and numerically equal to the distance in light-years. 
A)  the time it takes for the light from an object to reach Earth. 
B)  numerically equal to the distance in light-years. 
C)  smaller for more distant objects. 
D)  All of the other choices are correct. 
E)  the time it takes for the light from an object to reach Earth and numerically equal to the distance in light-years.

Question 18

The above visual wavelength image of a counter-clockwise rotating spiral galaxy indicates that the blueshifted emission lines are the dashed lines above the solid black horizontal line in the right panel and the redshifted emission lines are the dashed lines below the solid black horizontal line.

Accepted Answer

A) True 
 B)False

Question 19

The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen.

Accepted Answer

The answer of The spectrum of a(n) ____________________ consists of...

Question 20

​ What observational evidence do we have that quasars are the centers of very distant galaxies?

Accepted Answer

​ Telescopes in space and on Earth's sur

Starburst galaxies

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

A megaparsec is equivalent to

Poor clusters of galaxies often contain an excess of E and S0 galaxies.

_________________ galaxies are very luminous at X-ray and ultraviolet wavelengths and have broad emission lines in their spectra.

___________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.

If the above shown spiral galaxy is 150 million ly away, how fast is it receding?

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

Which kind of active galaxies has been observed at the greatest distances from us?

The letters AGN stand for

The unified model describes active galactic nuclei using

What is the Hubble constant essentially a measure of?

The hot spots in a double-lobed radio source

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

Differences among AGNs as viewed from different inclination angles is known as a ________________.

If the absolute magnitude, M , of a supernova is − 19 and a galaxy is found that contains a supernova with an apparent magnitude, m , of 16. What is the distance to the galaxy? Hint: d _pc = 10^{( m - M + 5)/5}

The look-back time is

The above visual wavelength image of a counter-clockwise rotating spiral galaxy indicates that the blueshifted emission lines are the dashed lines above the solid black horizontal line in the right panel and the redshifted emission lines are the dashed lines below the solid black horizontal line.

The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen.

What observational evidence do we have that quasars are the centers of very distant galaxies?

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

Starburst galaxies

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

A megaparsec is equivalent to

Poor clusters of galaxies often contain an excess of E and S0 galaxies.

_________________ galaxies are very luminous at X-ray and ultraviolet wavelengths and have broad emission lines in their spectra.

___________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.

If the above shown spiral galaxy is 150 million ly away, how fast is it receding?

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

Which kind of active galaxies has been observed at the greatest distances from us?

The letters AGN stand for

The unified model describes active galactic nuclei using

What is the Hubble constant essentially a measure of?

The hot spots in a double-lobed radio source

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

Differences among AGNs as viewed from different inclination angles is known as a ________________.

If the absolute magnitude, M , of a supernova is − 19 and a galaxy is found that contains a supernova with an apparent magnitude, m , of 16. What is the distance to the galaxy? Hint: d pc = 10( m - M + 5)/5

The look-back time is

The above visual wavelength image of a counter-clockwise rotating spiral galaxy indicates that the blueshifted emission lines are the dashed lines above the solid black horizontal line in the right panel and the redshifted emission lines are the dashed lines below the solid black horizontal line.

The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen.

​ What observational evidence do we have that quasars are the centers of very distant galaxies?

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

If the absolute magnitude, M , of a supernova is − 19 and a galaxy is found that contains a supernova with an apparent magnitude, m , of 16. What is the distance to the galaxy? Hint: d _pc = 10^{( m - M + 5)/5}

What observational evidence do we have that quasars are the centers of very distant galaxies?