Question 1

Synchrotron radiation found with active nuclei implies strong ________ fields directing andaccelerating the electrons trapped in them.

Accepted Answer

magnetic

Question 2

For finding the distance to M31, Hubble relied upon:

Accepted Answer

A) RR Lyrae stars in its globular clusters. 
B) type I supernova in its core. 
C) type II supernova in its spiral arms. 
D) Cepheid variables in its spiral arms. 
E) planetary nebulae near its core. 
A) RR Lyrae stars in its globular clusters. 
B) type I supernova in its core. 
C) type II supernova in its spiral arms. 
D) Cepheid variables in its spiral arms. 
E) planetary nebulae near its core. D

Question 3

The energy radiated by a typical quasar requires that its black hole accrete about:

Accepted Answer

A) one solar mass a century. 
B) one solar mass a decade. 
C) one solar mass a year. 
D) ten solar masses a year. 
E) one solar mass a day. 
A) one solar mass a century. 
B) one solar mass a decade. 
C) one solar mass a year. 
D) ten solar masses a year. 
E) one solar mass a day. D

Question 4

Some lobes of radio galaxies are in fact moving faster than the speed of light.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

All active galaxies and quasars emit mas

Question 6

Relate synchrotron radiation to the central engine of active galaxies.

Accepted Answer

This non-stellar radiation is produced b

Question 7

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 explaintheir 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 explaintheir output. 
E) they must be very small, but bright due to gravitational lensing.

Question 8

There is very little interstellar gas or dust in most elliptical galaxies.

Accepted Answer

A) True 
 B)False

Question 9

What is the nearest huge cluster of galaxies to our Local Group?

Accepted Answer

A) Coma Cluster 
B) Centaurus Cluster 
C) Virgo Cluster 
D) Orion Nebula 
E) Hercules Cluster 
A) Coma Cluster 
B) Centaurus Cluster 
C) Virgo Cluster 
D) Orion Nebula 
E) Hercules Cluster

Question 10

Which of the following is NOT one of Hubble's types of galaxies?

Accepted Answer

A) normal spirals 
B) barred spirals 
C) Seyfert spirals 
D) irregular type II 
E) dwarf ellipticals 
A) normal spirals 
B) barred spirals 
C) Seyfert spirals 
D) irregular type II 
E) dwarf ellipticals

Question 11

What is the nearest huge cluster of thousands of galaxies, to which the Local Group maybelong?

Accepted Answer

A) The Great Wall 
B) Coma Cluster 
C) Virgo Cluster 
D) Corona Borealis Cluster 
E) Sagittarius Cluster 
A) The Great Wall 
B) Coma Cluster 
C) Virgo Cluster 
D) Corona Borealis Cluster 
E) Sagittarius Cluster

Question 12

Quasars usually have their distances measured by what technique?

Accepted Answer

A) Type II supernovae 
B) Cepheids 
C) Parallax 
D) Hubble's Law 
E) Tully-Fisher relation 
A) Type II supernovae 
B) Cepheids 
C) Parallax 
D) Hubble's Law 
E) Tully-Fisher relation

Question 13

One consequence of nuclear activity in otherwise normal galaxies as well as in quasars is jetsof material moving outward at ________ speeds.

Accepted Answer

The answer of One consequence of nuclear activity in otherwise...

Question 14

Which of the following paraphrases Hubble's Law?

Accepted Answer

A) The faster the galaxy spins, the more massive and luminous it is. 
B) The greater the distance to a galaxy, the greater its redshift. 
C) The greater the distance to a galaxy, the fainter it is. 
D) The more distant a galaxy is, the younger it appears. 
E) The older the galaxy appears to us, the more luminous it is. 
A) The faster the galaxy spins, the more massive and luminous it is. 
B) The greater the distance to a galaxy, the greater its redshift. 
C) The greater the distance to a galaxy, the fainter it is. 
D) The more distant a galaxy is, the younger it appears. 
E) The older the galaxy appears to us, the more luminous it is.

Question 15

Why do some quasars have redshifts greater than 1?

Accepted Answer

A) They are made of different elements than any other objects in the universe. 
B) They are very distant, with relativistic redshifts that take into account dilation of space-time,as Einstein predicted. 
C) They are made of tachyons and thus are able to move away from us faster than the speed oflight. 
D) Einstein proved it is impossible to have a redshift greater than 1; these are all due togravitational lensing tricking us. 
E) They are moving towards us, which throws off our spectrometers. 
A) They are made of different elements than any other objects in the universe. 
B) They are very distant, with relativistic redshifts that take into account dilation of space-time,as Einstein predicted. 
C) They are made of tachyons and thus are able to move away from us faster than the speed oflight. 
D) Einstein proved it is impossible to have a redshift greater than 1; these are all due togravitational lensing tricking us. 
E) They are moving towards us, which throws off our spectrometers.

Question 16

The quasars with the largest presently known redshifts are close to:

Accepted Answer

A) .96. 
B) 3. 
C) 8. 
D) 20. 
E) 65. 
A) .96. 
B) 3. 
C) 8. 
D) 20. 
E) 65.

Question 17

In what sense are the quasars "quasi-stellar"?

Accepted Answer

A) Their energy production is hydrogen-helium fusion, like main sequence stars. 
B) They are upscale versions of O stars, yet hundreds of times more massive. 
C) Their luminosity comes from the millions of supergiants that compose them. 
D) Their spectra are like that of ordinary stars. 
E) In short time exposures, their images looked stellar. 
A) Their energy production is hydrogen-helium fusion, like main sequence stars. 
B) They are upscale versions of O stars, yet hundreds of times more massive. 
C) Their luminosity comes from the millions of supergiants that compose them. 
D) Their spectra are like that of ordinary stars. 
E) In short time exposures, their images looked stellar.

Question 18

Although theory says a massive black hole with an accretion disk should be emitting X-rays,many black holes emit:

Accepted Answer

A) mostly in the infrared. 
B) only in the visible. 
C) mainly in the gamma. 
D) virtually no radiation at all. 
E) equally across the entire electromagnetic spectrum. 
A) mostly in the infrared. 
B) only in the visible. 
C) mainly in the gamma. 
D) virtually no radiation at all. 
E) equally across the entire electromagnetic spectrum.

Question 19

In this diagram, the galaxy at the left side is a(n):

Accepted Answer

A) Seyfert. 
B) Spiral. 
C) Barred spiral. 
D) Elliptical. 
E) Irregular. 
A) Seyfert. 
B) Spiral. 
C) Barred spiral. 
D) Elliptical. 
E) Irregular.

Question 20

A spherical galaxy, like M87, which looks like a monster globular cluster, is type:

Accepted Answer

A)  $\mathrm { S } 0$ 
B) ES. 
C)  $\text { E0. }$ 
D)  $\text { ES1. }$ 
E)  $0 \mathrm {~V}$ 
A)  $\mathrm { S } 0$ 
B) ES. 
C)  $\text { E0. }$ 
D)  $\text { ES1. }$ 
E)  $0 \mathrm {~V}$

Exam 24: Galaxies: Building Blocks of the Universe

Synchrotron radiation found with active nuclei implies strong ________ fields directing andaccelerating the electrons trapped in them.

For finding the distance to M31, Hubble relied upon:

The energy radiated by a typical quasar requires that its black hole accrete about:

Some lobes of radio galaxies are in fact moving faster than the speed of light.

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

Relate synchrotron radiation to the central engine of active galaxies.

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

There is very little interstellar gas or dust in most elliptical galaxies.

What is the nearest huge cluster of galaxies to our Local Group?

Which of the following is NOT one of Hubble's types of galaxies?

What is the nearest huge cluster of thousands of galaxies, to which the Local Group maybelong?

Quasars usually have their distances measured by what technique?

One consequence of nuclear activity in otherwise normal galaxies as well as in quasars is jetsof material moving outward at ________ speeds.

Which of the following paraphrases Hubble's Law?

Why do some quasars have redshifts greater than 1?

The quasars with the largest presently known redshifts are close to:

In what sense are the quasars "quasi-stellar"?

Although theory says a massive black hole with an accretion disk should be emitting X-rays,many black holes emit:

In this diagram, the galaxy at the left side is a(n):

A spherical galaxy, like M87, which looks like a monster globular cluster, is type:

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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