Question 1

Most radio galaxies belong to Hubble's class _ .

Accepted Answer

The answer of Most radio galaxies belong to Hubble's class...

Question 2

When mass is accreted into a black hole, what fraction of the total mass- energy can be radiated away?

Accepted Answer

A)  0.007% 
B)  0.08% 
C)  1.4% 
D)  20% 
E)  50% 
A)  0.007% 
B)  0.08% 
C)  1.4% 
D)  20% 
E)  50%

Question 3

Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies.

Accepted Answer

A) True 
 B)False

Question 4

The spiral arms are blue from the presence of Population _ stars in them.

Accepted Answer

The answer of The spiral arms are blue from the...

Question 5

What is true of the lobes of a radio galaxy?

Accepted Answer

A)  They extend out along the galactic plane. 
B)  They are hotter than the galactic core. 
C)  They form close to the edge of the galaxy. 
D)  They radiate primarily in X- rays. 
E)  They are perpendicular to the galactic plane. 
A)  They extend out along the galactic plane. 
B)  They are hotter than the galactic core. 
C)  They form close to the edge of the galaxy. 
D)  They radiate primarily in X- rays. 
E)  They are perpendicular to the galactic plane.

Question 6

Hubble divided the spiral galaxies up in what six subtypes?

Accepted Answer

Sa, Sb, Sc

Question 7

The Milky Way and M31 in Andromeda both belong to the _.

Accepted Answer

The answer of The Milky Way and M31 in Andromeda...

Question 8

Why can the Tully- Fisher relation be used at greater distances than Cepheids?

Accepted Answer

We must image the individual star and fo

Question 9

What is true of giant and dwarf elliptical galaxies?

Accepted Answer

A)  The dwarfs contain more total mass than the giants. 
B)  The giants contain more total mass than the dwarfs. 
C)  There are more giants than dwarfs. 
D)  The giants are mostly blue, the dwarfs are mostly red. 
E)  They contain more dust than spirals. 
A)  The dwarfs contain more total mass than the giants. 
B)  The giants contain more total mass than the dwarfs. 
C)  There are more giants than dwarfs. 
D)  The giants are mostly blue, the dwarfs are mostly red. 
E)  They contain more dust than spirals.

Question 10

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

Question 11

The closest other galaxy to our solar system is the Sagittarius Dwarf.

Accepted Answer

A) True 
 B)False

Question 12

Some giant elliptical galaxies are found to have disks of gas and dust with star forming regions, and are probably the result of .

Accepted Answer

The answer of Some giant elliptical galaxies are found to...

Question 13

What is meant by a cosmological distance?

Accepted Answer

A distance on the scale of the

Question 14

What is true of the Local Group?

Accepted Answer

A)  The Andromeda galaxy is a satellite of the Milky Way. 
B)  The giant ellipticals are the largest members. 
C)  It contains about 2500 galaxies. 
D)  The Andromeda galaxy (M31), and the Milky Way are the two largest galaxies. 
E)  It consists of mostly spirals. 
A)  The Andromeda galaxy is a satellite of the Milky Way. 
B)  The giant ellipticals are the largest members. 
C)  It contains about 2500 galaxies. 
D)  The Andromeda galaxy (M31), and the Milky Way are the two largest galaxies. 
E)  It consists of mostly spirals.

Question 15

The classical pinwheel- shaped galaxies are , according to Hubble.

Accepted Answer

A)  lenticulars 
B)  spirals 
C)  ellipticals 
D)  irregulars 
E)  radio lobes 
A)  lenticulars 
B)  spirals 
C)  ellipticals 
D)  irregulars 
E)  radio lobes

Question 16

The lobes of radio galaxies are perpendicular to their plane of rotation.

Accepted Answer

A) True 
 B)False

Question 17

The radio lobes of active galaxies can span of light-years.

Accepted Answer

A)  tens 
B)  hundreds 
C)  thousands 
D)  millions 
E)  billions 
A)  tens 
B)  hundreds 
C)  thousands 
D)  millions 
E)  billions

Question 18

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

Accepted Answer

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

Question 19

The spectrum of radio galaxies matches radiation, and is produced in strong magnetic fields.

Accepted Answer

The answer of The spectrum of radio galaxies matches radiation,...

Question 20

Which property is common to spiral galaxies?

Accepted Answer

A)  globular clusters in the nucleus 
B)  ongoing star formation and emission nebula in the arms 
C)  open clusters in the halo 
D)  very little internal structure 
E)  ongoing star formation and emission nebula in the halo 
A)  globular clusters in the nucleus 
B)  ongoing star formation and emission nebula in the arms 
C)  open clusters in the halo 
D)  very little internal structure 
E)  ongoing star formation and emission nebula in the halo

Most radio galaxies belong to Hubble's class _ .

When mass is accreted into a black hole, what fraction of the total mass- energy can be radiated away?

Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies.

The spiral arms are blue from the presence of Population _ stars in them.

What is true of the lobes of a radio galaxy?

Hubble divided the spiral galaxies up in what six subtypes?

The Milky Way and M31 in Andromeda both belong to the _.

Why can the Tully- Fisher relation be used at greater distances than Cepheids?

What is true of giant and dwarf elliptical galaxies?

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

The closest other galaxy to our solar system is the Sagittarius Dwarf.

Some giant elliptical galaxies are found to have disks of gas and dust with star forming regions, and are probably the result of .

What is meant by a cosmological distance?

What is true of the Local Group?

The classical pinwheel- shaped galaxies are , according to Hubble.

The lobes of radio galaxies are perpendicular to their plane of rotation.

The radio lobes of active galaxies can span of light-years.

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

The spectrum of radio galaxies matches radiation, and is produced in strong magnetic fields.

Which property is common to spiral galaxies?

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

Measuring the Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Star Formation in the Milky Way

Stellar Evolution: the Lives and Deaths of Stars

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

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Exam 16: Normal and Active Galaxies: Building Blocks of the Universe

Most radio galaxies belong to Hubble's class _ .

When mass is accreted into a black hole, what fraction of the total mass- energy can be radiated away?

Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies.

The spiral arms are blue from the presence of Population _ stars in them.

What is true of the lobes of a radio galaxy?

Hubble divided the spiral galaxies up in what six subtypes?

The Milky Way and M31 in Andromeda both belong to the _.

Why can the Tully- Fisher relation be used at greater distances than Cepheids?

What is true of giant and dwarf elliptical galaxies?

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

The closest other galaxy to our solar system is the Sagittarius Dwarf.

Some giant elliptical galaxies are found to have disks of gas and dust with star forming regions, and are probably the result of .

What is meant by a cosmological distance?

What is true of the Local Group?

The classical pinwheel- shaped galaxies are , according to Hubble.

The lobes of radio galaxies are perpendicular to their plane of rotation.

The radio lobes of active galaxies can span of light-years.

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

The spectrum of radio galaxies matches radiation, and is produced in strong magnetic fields.

Which property is common to spiral galaxies?

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

Measuring the Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Star Formation in the Milky Way

Stellar Evolution: the Lives and Deaths of Stars

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

Filters