Question 1

All RR Lyrae stars have about the same

Accepted Answer

A)  luminosity of about 100 Suns. 
B)  galactic location and speed. 
C)  locations in the centers of globular star clusters. 
D)  period of six days. 
E)  distance of 32 light-years. 
A)  luminosity of about 100 Suns. 
B)  galactic location and speed. 
C)  locations in the centers of globular star clusters. 
D)  period of six days. 
E)  distance of 32 light-years.

Question 2

Most of the mass of the Milky Way seems to exist in the form of

Accepted Answer

A)  the black hole in the Galactic Center. 
B)  dark matter out in the Halo. 
C)  hydrogen gas in the disk and spiral arms. 
D)  population II stars in the Halo. 
E)  population I stars in the disk. 
A)  the black hole in the Galactic Center. 
B)  dark matter out in the Halo. 
C)  hydrogen gas in the disk and spiral arms. 
D)  population II stars in the Halo. 
E)  population I stars in the disk.

Question 3

What use are 21- cm radio waves to galactic astronomers?

Accepted Answer

A)  They bounce off stars like our Sun to let us precisely measure their distances. 
B)  They cut through the dusty cocoons to let us watch star birth. 
C)  They pick up the cool, dark matter much better than can optical telescopes. 
D)  Their Doppler shifts let us map the motions and locations of gas in the spiral arms. 
E)  We can reflect them off the core of the Galaxy. 
A)  They bounce off stars like our Sun to let us precisely measure their distances. 
B)  They cut through the dusty cocoons to let us watch star birth. 
C)  They pick up the cool, dark matter much better than can optical telescopes. 
D)  Their Doppler shifts let us map the motions and locations of gas in the spiral arms. 
E)  We can reflect them off the core of the Galaxy.

Question 4

The density wave theory attempts to explain why the spiral arm structure persists over a long time.

Accepted Answer

A) True 
 B)False

Question 5

Which of these is NOT typical of the Galaxy's spiral arms?

Accepted Answer

A)  O and B stars 
B)  Population II giants like orange Arcturus 
C)  emission nebulae like M42 
D)  hot, young blue Population I stars 
E)  open clusters 
A)  O and B stars 
B)  Population II giants like orange Arcturus 
C)  emission nebulae like M42 
D)  hot, young blue Population I stars 
E)  open clusters

Question 6

Cepheids are good examples of cataclysmic variable stars.

Accepted Answer

A) True 
 B)False

Question 7

Which statement about Population II is false?

Accepted Answer

A)  They formed first as the Galaxy formed. 
B)  They are made of almost nothing but hydrogen and helium. 
C)  At almost five billion years old, our Sun must belong to this older Population. 
D)  Their orbits around the Galaxy resemble those of comets. 
E)  The globular clusters are their most obvious groupings. 
A)  They formed first as the Galaxy formed. 
B)  They are made of almost nothing but hydrogen and helium. 
C)  At almost five billion years old, our Sun must belong to this older Population. 
D)  Their orbits around the Galaxy resemble those of comets. 
E)  The globular clusters are their most obvious groupings.

Question 8

Compare the orbital motion of stars in the Galactic disk with those in the halo.

Accepted Answer

Stars in the disk orbit the galactic cen

Question 9

Open clusters are found in the of our Milky Way Galaxy.

Accepted Answer

disc (or s

Question 10

It was _ in the Galactic disk that threw Herschel's model of the size and structure of the Galaxy off badly.

Accepted Answer

The answer of It was _ in the Galactic disk...

Question 11

According to the ages of the globular clusters, our Galaxy is about times as old as the solar system.

Accepted Answer

The answer of According to the ages of the globular...

Question 12

All Cepheid variables discovered so far lie in other galaxies.

Accepted Answer

A) True 
 B)False

Question 13

Which of these objects have NOT been found in the Galactic Halo?

Accepted Answer

A)  Population II stars 
B)  emission nebulae 
C)  Cepheid variables 
D)  globular clusters 
E)  RR Lyrae variables 
A)  Population II stars 
B)  emission nebulae 
C)  Cepheid variables 
D)  globular clusters 
E)  RR Lyrae variables

Question 14

To determine the distance to a Cepheid, we must measure its of pulsation.

Accepted Answer

The answer of To determine the distance to a Cepheid,...

Question 15

What are the three main parts of our Galaxy?

Accepted Answer

The disk,

Question 16

It would be very unlikely to find a massive, young star out in the halo.

Accepted Answer

A) True 
 B)False

Question 17

What is one of the differences between Cepheids and RR Lyrae variables?

Accepted Answer

A)  Cepheids are giants, but RR Lyrae stars are still on the main sequence. 
B)  The pulsations of RR Lyrae stars are much less regular than those of Cepheids. 
C)  The RR Lyrae stars have much shorter periods than Cepheids. 
D)  The period- luminosity relation holds only for RR Lyrae stars. 
E)  All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity. 
A)  Cepheids are giants, but RR Lyrae stars are still on the main sequence. 
B)  The pulsations of RR Lyrae stars are much less regular than those of Cepheids. 
C)  The RR Lyrae stars have much shorter periods than Cepheids. 
D)  The period- luminosity relation holds only for RR Lyrae stars. 
E)  All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity.

Question 18

Harlow Shapley found the Milky Way was

Accepted Answer

A)  much larger than previously thought. 
B)  uniformly spherical in shape. 
C)  much smaller than previously thought. 
D)  centered on the Earth. 
E)  rapidly expanding. 
A)  much larger than previously thought. 
B)  uniformly spherical in shape. 
C)  much smaller than previously thought. 
D)  centered on the Earth. 
E)  rapidly expanding.

Question 19

Which method relies on the mass of a dark object revealing its presence?

Accepted Answer

A)  temporary brightening of a distant star by a gravity lens 
B)  asteroidal occultations 
C)  ring occultations 
D)  pulsars slowing down irregularly 
E)  stellar eclipses 
A)  temporary brightening of a distant star by a gravity lens 
B)  asteroidal occultations 
C)  ring occultations 
D)  pulsars slowing down irregularly 
E)  stellar eclipses

Question 20

This diagram shows the period- luminosity relationship. A Cepheid variable with a period of 5 days will have a luminosity of _ _ solar luminosities.

Accepted Answer

The answer of This diagram shows the period- luminosity relationship....

All RR Lyrae stars have about the same

Most of the mass of the Milky Way seems to exist in the form of

What use are 21- cm radio waves to galactic astronomers?

The density wave theory attempts to explain why the spiral arm structure persists over a long time.

Which of these is NOT typical of the Galaxy's spiral arms?

Cepheids are good examples of cataclysmic variable stars.

Which statement about Population II is false?

Compare the orbital motion of stars in the Galactic disk with those in the halo.

Open clusters are found in the of our Milky Way Galaxy.

It was _ in the Galactic disk that threw Herschel's model of the size and structure of the Galaxy off badly.

According to the ages of the globular clusters, our Galaxy is about times as old as the solar system.

All Cepheid variables discovered so far lie in other galaxies.

Which of these objects have NOT been found in the Galactic Halo?

To determine the distance to a Cepheid, we must measure its of pulsation.

What are the three main parts of our Galaxy?

It would be very unlikely to find a massive, young star out in the halo.

What is one of the differences between Cepheids and RR Lyrae variables?

Harlow Shapley found the Milky Way was

Which method relies on the mass of a dark object revealing its presence?

This diagram shows the period- luminosity relationship. A Cepheid variable with a period of 5 days will have a luminosity of _ _ solar luminosities.

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

Normal and Active Galaxies: Building Blocks of the Universe

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 15: The Milky Way Galaxy: a Spiral in Space

All RR Lyrae stars have about the same

Most of the mass of the Milky Way seems to exist in the form of

What use are 21- cm radio waves to galactic astronomers?

The density wave theory attempts to explain why the spiral arm structure persists over a long time.

Which of these is NOT typical of the Galaxy's spiral arms?

Cepheids are good examples of cataclysmic variable stars.

Which statement about Population II is false?

Compare the orbital motion of stars in the Galactic disk with those in the halo.

Open clusters are found in the of our Milky Way Galaxy.

It was _ in the Galactic disk that threw Herschel's model of the size and structure of the Galaxy off badly.

According to the ages of the globular clusters, our Galaxy is about times as old as the solar system.

All Cepheid variables discovered so far lie in other galaxies.

Which of these objects have NOT been found in the Galactic Halo?

To determine the distance to a Cepheid, we must measure its of pulsation.

What are the three main parts of our Galaxy?

It would be very unlikely to find a massive, young star out in the halo.

What is one of the differences between Cepheids and RR Lyrae variables?

Harlow Shapley found the Milky Way was

Which method relies on the mass of a dark object revealing its presence?

This diagram shows the period- luminosity relationship. A Cepheid variable with a period of 5 days will have a luminosity of _ _ solar luminosities.

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

Normal and Active Galaxies: Building Blocks of the Universe

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