Question 1

Variable stars are ones whose changes over time.

Accepted Answer

The answer of Variable stars are ones whose changes over...

Question 2

The location of the Galactic Center was first found by Harlow Shapley with

Accepted Answer

A)  radio emissions from Sagittarius A. 
B)  planetary nebulae in the open clusters. 
C)  infrared observations of the heat from its accretion disk around the black hole. 
D)  RR Lyrae variables in the globular clusters. 
E)  Cepheids of population I in the spiral arms. 
A)  radio emissions from Sagittarius A. 
B)  planetary nebulae in the open clusters. 
C)  infrared observations of the heat from its accretion disk around the black hole. 
D)  RR Lyrae variables in the globular clusters. 
E)  Cepheids of population I in the spiral arms.

Question 3

The instability strip is above the main sequence on the H- R diagram.

Accepted Answer

A) True 
 B)False

Question 4

The stars of the halo are all old, and those of the disk are all new.

Accepted Answer

A) True 
 B)False

Question 5

The instability strip shows that not all main- sequence stars are, in fact, stable.

Accepted Answer

A) True 
 B)False

Question 6

Compare the rotation of the stars and the spiral density wave pattern in our Galaxy. How is it observed?

Accepted Answer

The density wave moves slower

Question 7

In structure, our Milky Way is most similar to

Accepted Answer

A)  the Orion nebula. 
B)  the Large Magellanic Cloud. 
C)  M31, the Andromeda Galaxy. 
D)  an upscale version of a globular cluster. 
E)  none of these 
A)  the Orion nebula. 
B)  the Large Magellanic Cloud. 
C)  M31, the Andromeda Galaxy. 
D)  an upscale version of a globular cluster. 
E)  none of these

Question 8

Why is visible light a bad choice for studying the core of the Galaxy? What is better?

Accepted Answer

Dust in the galactic plane blocks our vi

Question 9

Why did Hubble have to rely on Cepheids to find the distance to M31, unlike Shapley's use of RR Lyrae stars with the Milky Way?

Accepted Answer

The RR Lyrae stars were not bright enoug

Question 10

The Copernican Principle notes that we are nothing special, not at the center of anything. Apply it to the work of Harlow Shapley.

Accepted Answer

While Herschel's star counts suggested t

Question 11

Which of these variable stars would be classified as an RR Lyrae?

Accepted Answer

A)  a K giant with a period of 14 days 
B)  a pulsar with a period of 0.14 seconds 
C)  a B supergiant with a period of 0.14 days 
D)  an F giant with a period of 14 hours 
E)  an M giant with a period of 140 days 
A)  a K giant with a period of 14 days 
B)  a pulsar with a period of 0.14 seconds 
C)  a B supergiant with a period of 0.14 days 
D)  an F giant with a period of 14 hours 
E)  an M giant with a period of 140 days

Question 12

The RR Lyrae stars all have periods of

Accepted Answer

A)  less than a second. 
B)  several minutes. 
C)  several hours. 
D)  several days. 
E)  several weeks. 
A)  less than a second. 
B)  several minutes. 
C)  several hours. 
D)  several days. 
E)  several weeks.

Question 13

How old is the Galaxy? How do we know this?

Accepted Answer

The H- R diagrams of the globular cluste

Question 14

The strange object is believed to be the black hole in the center of our Galaxy.

Accepted Answer

Sgr A* or

Question 15

The Galactic Year is the time for our solar system to orbit the Galaxy; it is about

Accepted Answer

A)  15 million years. 
B)  225 million years. 
C)  4.5 billion years. 
D)  9.6 billion years. 
E)  13.5 billion years. 
A)  15 million years. 
B)  225 million years. 
C)  4.5 billion years. 
D)  9.6 billion years. 
E)  13.5 billion years.

Question 16

What two observations allow us to calculate mass of the portion of the Galaxy within the Sun's orbit?

Accepted Answer

A)  the Sun's mass and its age 
B)  the Sun's composition and luminosity 
C)  the Sun's age and period of the Galactic Year 
D)  the Sun's orbital velocity and its distance from the Galactic Center 
E)  the Sun's mass and velocity in orbit of the Galactic Center 
A)  the Sun's mass and its age 
B)  the Sun's composition and luminosity 
C)  the Sun's age and period of the Galactic Year 
D)  the Sun's orbital velocity and its distance from the Galactic Center 
E)  the Sun's mass and velocity in orbit of the Galactic Center

Question 17

Our solar system lies in the Milky Way's , about 30,000 light-years from the Galactic Center.

Accepted Answer

A)  satellite galaxy 
B)  halo 
C)  globular cluster 
D)  bulge 
E)  disk 
A)  satellite galaxy 
B)  halo 
C)  globular cluster 
D)  bulge 
E)  disk

Question 18

Herschel's map of the Galaxy was too small because blocked much of the starlight.

Accepted Answer

The answer of Herschel's map of the Galaxy was too...

Question 19

It is harder to map the structure of the Milky Way in visible wavelengths than with radio and infrared waves.

Accepted Answer

A) True 
 B)False

Question 20

Relate the Galaxy's spiral arms to the spiral- density wave theory.

Accepted Answer

Spiral- density waves compress the gas a

Variable stars are ones whose changes over time.

The location of the Galactic Center was first found by Harlow Shapley with

The instability strip is above the main sequence on the H- R diagram.

The stars of the halo are all old, and those of the disk are all new.

The instability strip shows that not all main- sequence stars are, in fact, stable.

Compare the rotation of the stars and the spiral density wave pattern in our Galaxy. How is it observed?

In structure, our Milky Way is most similar to

Why is visible light a bad choice for studying the core of the Galaxy? What is better?

Why did Hubble have to rely on Cepheids to find the distance to M31, unlike Shapley's use of RR Lyrae stars with the Milky Way?

The Copernican Principle notes that we are nothing special, not at the center of anything. Apply it to the work of Harlow Shapley.

Which of these variable stars would be classified as an RR Lyrae?

The RR Lyrae stars all have periods of

How old is the Galaxy? How do we know this?

The strange object is believed to be the black hole in the center of our Galaxy.

The Galactic Year is the time for our solar system to orbit the Galaxy; it is about

What two observations allow us to calculate mass of the portion of the Galaxy within the Sun's orbit?

Our solar system lies in the Milky Way's , about 30,000 light-years from the Galactic Center.

Herschel's map of the Galaxy was too small because blocked much of the starlight.

It is harder to map the structure of the Milky Way in visible wavelengths than with radio and infrared waves.

Relate the Galaxy's spiral arms to the spiral- density wave theory.

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

Variable stars are ones whose changes over time.

The location of the Galactic Center was first found by Harlow Shapley with

The instability strip is above the main sequence on the H- R diagram.

The stars of the halo are all old, and those of the disk are all new.

The instability strip shows that not all main- sequence stars are, in fact, stable.

Compare the rotation of the stars and the spiral density wave pattern in our Galaxy. How is it observed?

In structure, our Milky Way is most similar to

Why is visible light a bad choice for studying the core of the Galaxy? What is better?

Why did Hubble have to rely on Cepheids to find the distance to M31, unlike Shapley's use of RR Lyrae stars with the Milky Way?

The Copernican Principle notes that we are nothing special, not at the center of anything. Apply it to the work of Harlow Shapley.

Which of these variable stars would be classified as an RR Lyrae?

The RR Lyrae stars all have periods of

How old is the Galaxy? How do we know this?

The strange object is believed to be the black hole in the center of our Galaxy.

The Galactic Year is the time for our solar system to orbit the Galaxy; it is about

What two observations allow us to calculate mass of the portion of the Galaxy within the Sun's orbit?

Our solar system lies in the Milky Way's , about 30,000 light-years from the Galactic Center.

Herschel's map of the Galaxy was too small because blocked much of the starlight.

It is harder to map the structure of the Milky Way in visible wavelengths than with radio and infrared waves.

Relate the Galaxy's spiral arms to the spiral- density wave theory.

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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