Question 1

Our galaxy is classified as an Sd galaxy in the Hubble sequence.

Accepted Answer

A) True 
 B)False

Question 2

What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars?

Accepted Answer

A)  The rotation curve 
B)  The velocities of the open star clusters 
C)  The number and shape of the spiral arms 
D)  The thickness of the disk 
A)  The rotation curve 
B)  The velocities of the open star clusters 
C)  The number and shape of the spiral arms 
D)  The thickness of the disk

Question 3

What type of standard candle is used to determine distances to globular clusters?

Accepted Answer

A)  RR Lyrae stars 
B)  Cepheid variable stars 
C)  T Tauri stars 
D)  Type I supernovae 
A)  RR Lyrae stars 
B)  Cepheid variable stars 
C)  T Tauri stars 
D)  Type I supernovae

Question 4

In a star that has a chemical abundance similar to the Sun,what percentage of its mass is made of heavy elements?

Accepted Answer

A)  0.02 percent 
B)  0.2 percent 
C)  2 percent 
D)  20 percent 
A)  0.02 percent 
B)  0.2 percent 
C)  2 percent 
D)  20 percent

Question 5

If you wanted to study the properties of nearby stars that were some of the first stars to form in the Milky Way,but were NOT members of a globular cluster,how could you go about finding them?

Accepted Answer

You would look for stars that were membe

Question 6

The stars in the disk of the Milky Way near the Sun have

Accepted Answer

A)  chemical abundances similar to the Sun. 
B)  much higher velocities than the Sun. 
C)  chemical abundances that are on average ten times higher than the Sun. 
D)  much lower velocities than the Sun. 
A)  chemical abundances similar to the Sun. 
B)  much higher velocities than the Sun. 
C)  chemical abundances that are on average ten times higher than the Sun. 
D)  much lower velocities than the Sun.

Question 7

Studying standard candles in globular clusters offered the first conclusive proof that our galaxy was much __________ than originally believed.

Accepted Answer

A)  smaller 
B)  rounder 
C)  larger 
D)  flatter 
A)  smaller 
B)  rounder 
C)  larger 
D)  flatter

Question 8

The energy of a cosmic ray is given by   ,where m is the mass of the particle,c is the speed of light,and $\gamma$ is the Lorentz factor and   .If a cosmic ray proton is traveling at a speed of   ,what is its energy? How does that compare to the kinetic energy of a grape thrown up in the air and caught in your mouth? Assume the grape has a mass of about 5 grams and a speed of 0.5 m/s when you catch it.The mass of a proton is   .

Accepted Answer

The cosmic ray proton has a Lo

Question 9

Magnetic fields in the Milky Way are concentrated in the disk because

Accepted Answer

A)  halo stars are incapable of producing strong magnetic fields. 
B)  the fields are tied to the charged particles in dense molecular clouds. 
C)  gravity forces them to sink to the center of the disk. 
D)  supernovae explosions continually force them toward the middle of the disk. 
A)  halo stars are incapable of producing strong magnetic fields. 
B)  the fields are tied to the charged particles in dense molecular clouds. 
C)  gravity forces them to sink to the center of the disk. 
D)  supernovae explosions continually force them toward the middle of the disk.

Question 10

What is ripping apart the Sagittarius dwarf spheroidal galaxy?

Accepted Answer

A)  A supermassive black hole at its center 
B)  The energetic decay of a WIMP 
C)  A violent episode of star formation 
D)  The gravitational tidal force of the Milky Way 
A)  A supermassive black hole at its center 
B)  The energetic decay of a WIMP 
C)  A violent episode of star formation 
D)  The gravitational tidal force of the Milky Way

Our galaxy is classified as an Sd galaxy in the Hubble sequence.

What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars?

What type of standard candle is used to determine distances to globular clusters?

In a star that has a chemical abundance similar to the Sun,what percentage of its mass is made of heavy elements?

If you wanted to study the properties of nearby stars that were some of the first stars to form in the Milky Way,but were NOT members of a globular cluster,how could you go about finding them?

The stars in the disk of the Milky Way near the Sun have

Studying standard candles in globular clusters offered the first conclusive proof that our galaxy was much __________ than originally believed.

Magnetic fields in the Milky Way are concentrated in the disk because

What is ripping apart the Sagittarius dwarf spheroidal galaxy?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

Modern Cosmology

The Origin of Structure

Life

Filters

Exam 20: The Milky Waya Normal Spiral Galaxy

Our galaxy is classified as an Sd galaxy in the Hubble sequence.

What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars?

What type of standard candle is used to determine distances to globular clusters?

In a star that has a chemical abundance similar to the Sun,what percentage of its mass is made of heavy elements?

If you wanted to study the properties of nearby stars that were some of the first stars to form in the Milky Way,but were NOT members of a globular cluster,how could you go about finding them?

The stars in the disk of the Milky Way near the Sun have

Studying standard candles in globular clusters offered the first conclusive proof that our galaxy was much __________ than originally believed.

Magnetic fields in the Milky Way are concentrated in the disk because

What is ripping apart the Sagittarius dwarf spheroidal galaxy?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

Modern Cosmology

The Origin of Structure

Life

Filters