Question 1

Which type of galaxy has a stellar disk, but without gas and dust?

Accepted Answer

A) E0 
B) E7 
C) Irr I 
D)  $\text { S0 }$ 
E) SE 
A) E0 
B) E7 
C) Irr I 
D)  $\text { S0 }$ 
E) SE

Question 2

The Tully-Fisher relation is much like the mass-luminosity relationship, except that thegalaxy's rotation is used to find its mass; the greater the mass, the faster the rotation rate.

Accepted Answer

A) True 
 B)False

Question 3

________ galaxies seem to represent a transition between quasars and similar active nucleicompared to more normal spirals.

Accepted Answer

The answer of ________ galaxies seem to represent a transition...

Question 4

The greatest variation in size, mass, and luminosity occurs in:

Accepted Answer

A) globular clusters. 
B) elliptical galaxies. 
C) spiral and barred spiral galaxies. 
D) type I vs. type II irregulars. 
E) Seyfert galaxies. 
A) globular clusters. 
B) elliptical galaxies. 
C) spiral and barred spiral galaxies. 
D) type I vs. type II irregulars. 
E) Seyfert galaxies.

Question 5

Type I supernovae can be used to determine distances to galaxies much better than type IIsupernovae.

Accepted Answer

A) True 
 B)False

Question 6

A quasar's spectral lines are:

Accepted Answer

A) emission lines with large redshifts. 
B) a continuum from the synchrotron radiation. 
C) fuzzy absorption lines from the merged light of the billions of stars. 
D) too complex for any interpretation. 
E) nonexistent, the gas so hot as to be totally ionized, so no lines are seen. 
A) emission lines with large redshifts. 
B) a continuum from the synchrotron radiation. 
C) fuzzy absorption lines from the merged light of the billions of stars. 
D) too complex for any interpretation. 
E) nonexistent, the gas so hot as to be totally ionized, so no lines are seen.

Question 7

Quasar is short for what? Is this true of all of them?

Accepted Answer

Quasi-stellar radio

Question 8

According to the Tully-Fisher relation, the rotational speed of a spiral galaxy, as indicated bythe broadening of spectral lines, allows us to determine the galaxy's

Accepted Answer

A) luminosity. 
B) color. 
C) redshift. 
D) mass. 
E) shape. 
A) luminosity. 
B) color. 
C) redshift. 
D) mass. 
E) shape.

Question 9

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 10

Most galaxies are spirals.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following is true about the ages and masses of spiral and elliptical galaxies?

Accepted Answer

A) Ellipticals are all older and more massive than spirals. 
B) Spirals are older, and much more massive than ellipticals. 
C) Both types are about the same age, but spirals vary less in mass. 
D) Spirals are younger and much more massive than any elliptical. 
E) Ellipticals are older, and show a far wider range of masses than do spirals. 
A) Ellipticals are all older and more massive than spirals. 
B) Spirals are older, and much more massive than ellipticals. 
C) Both types are about the same age, but spirals vary less in mass. 
D) Spirals are younger and much more massive than any elliptical. 
E) Ellipticals are older, and show a far wider range of masses than do spirals.

Question 12

Explain as exactly as possible the way in which the central engine of active galaxies andquasars actually works. Why is the orientation so important?

Accepted Answer

Matter from an accretion disk falls into

Question 13

The Magellanic Clouds are good examples of the ________ type of galaxy.

Accepted Answer

The answer of The Magellanic Clouds are good examples of...

Question 14

Briefly describe how Hubble classified the galaxies visually.

Accepted Answer

Ellipticals were divided into eight cate

Question 15

A galaxy that was once a quasar is likely to:

Accepted Answer

A) have burned all its fuel by now and be dark. 
B) now be a dwarf irregular. 
C) have a black hole at its nucleus. 
D) still be a quasar. 
E) be less than 5 billion years old. 
A) have burned all its fuel by now and be dark. 
B) now be a dwarf irregular. 
C) have a black hole at its nucleus. 
D) still be a quasar. 
E) be less than 5 billion years old.

Question 16

When mass is accreted into a black hole, how much total mass-energy can be radiated away?

Accepted Answer

A) .007% 
B) .08% 
C) 1.4% 
D) 20% 
E) 50% 
A) .007% 
B) .08% 
C) 1.4% 
D) 20% 
E) 50%

Question 17

The Large and Small Magellanic Clouds fall into Hubble's class:

Accepted Answer

A) SBc. 
B) Pec. 
C)  $\text { E6. }$ 
D)  $\text { Irr I. }$ 
E)  $\text { E3. }$ 
A) SBc. 
B) Pec. 
C)  $\text { E6. }$ 
D)  $\text { Irr I. }$ 
E)  $\text { E3. }$

Question 18

The Tully-Fisher relation exists between the galaxy's luminosity and its:

Accepted Answer

A) color. 
B) age. 
C) rotation. 
D) mass. 
E) size. 
A) color. 
B) age. 
C) rotation. 
D) mass. 
E) size.

Question 19

A billion solar mass black hole would still have a radius of only:

Accepted Answer

A) 20 A.U. 
B) 15 parsecs. 
C) 150 kilometers. 
D) 3 kpc. 
E) two million light-years. 
A) 20 A.U. 
B) 15 parsecs. 
C) 150 kilometers. 
D) 3 kpc. 
E) two million light-years.

Question 20

Explain what a standard candle is and how it could be used to determine a galaxy's distance.

Accepted Answer

A standard candle is an object with a we

Exam 24: Galaxies: Building Blocks of the Universe

Which type of galaxy has a stellar disk, but without gas and dust?

The Tully-Fisher relation is much like the mass-luminosity relationship, except that thegalaxy's rotation is used to find its mass; the greater the mass, the faster the rotation rate.

________ galaxies seem to represent a transition between quasars and similar active nucleicompared to more normal spirals.

The greatest variation in size, mass, and luminosity occurs in:

Type I supernovae can be used to determine distances to galaxies much better than type IIsupernovae.

A quasar's spectral lines are:

Quasar is short for what? Is this true of all of them?

According to the Tully-Fisher relation, the rotational speed of a spiral galaxy, as indicated bythe broadening of spectral lines, allows us to determine the galaxy's

The lobes of a radio galaxy can be as much as:

Most galaxies are spirals.

Which of the following is true about the ages and masses of spiral and elliptical galaxies?

Explain as exactly as possible the way in which the central engine of active galaxies andquasars actually works. Why is the orientation so important?

The Magellanic Clouds are good examples of the ________ type of galaxy.

Briefly describe how Hubble classified the galaxies visually.

A galaxy that was once a quasar is likely to:

When mass is accreted into a black hole, how much total mass-energy can be radiated away?

The Large and Small Magellanic Clouds fall into Hubble's class:

The Tully-Fisher relation exists between the galaxy's luminosity and its:

A billion solar mass black hole would still have a radius of only:

Explain what a standard candle is and how it could be used to determine a galaxy's distance.

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information From the Cosmos

Spectroscopy: the Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earths Sister Planet

Mars: a Near Miss for Life

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Gas and Dust Among the Stars

Star Formation: a Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone

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