Question 1

RR Lyrae variable stars are bigger,brighter and have longer periods of pulsation than Cepheid variables.

Accepted Answer

A) True 
 B)False

Question 2

In a spin-flip transition of an electron,a photon is emitted.

Accepted Answer

A) True 
 B)False

Question 3

Where would you look in our Galaxy to find older,metal-poor stars?

Accepted Answer

A)  In the disk and spiral arms 
B)  Everywhere in the Galaxy 
C)  In the globular clusters in the galactic halo 
D)  Only at the galactic center 
A)  In the disk and spiral arms 
B)  Everywhere in the Galaxy 
C)  In the globular clusters in the galactic halo 
D)  Only at the galactic center

Question 4

The major advantage of the measurement of the 21-cm radio emission from hydrogen gas for investigating the spiral structure of our Galaxy is that

Accepted Answer

A)  Doppler shift of this narrow-wavelength line emission is caused by the temperature of the hot hydrogen gas and therefore can be used to measure the distribution and temperature of this important component of the Milky Way. 
B)  it is relatively easily absorbed by hydrogen gas in the Milky Way so that measurements are not confused by emission of this radiation from other galaxies beyond the Milky Way.It originates only from cold hydrogen gas and can be used to map this important component. 
C)  this emission can easily penetrate the Milky Way gas and dust and comes only from hot gas;hence,it can be used to map the distribution of hot hydrogen gas. 
D)  radio waves easily penetrate the Milky Way dust and gas;it is a very narrow wavelength,thus its Doppler shift can be used to measure gas motions. 
A)  Doppler shift of this narrow-wavelength line emission is caused by the temperature of the hot hydrogen gas and therefore can be used to measure the distribution and temperature of this important component of the Milky Way. 
B)  it is relatively easily absorbed by hydrogen gas in the Milky Way so that measurements are not confused by emission of this radiation from other galaxies beyond the Milky Way.It originates only from cold hydrogen gas and can be used to map this important component. 
C)  this emission can easily penetrate the Milky Way gas and dust and comes only from hot gas;hence,it can be used to map the distribution of hot hydrogen gas. 
D)  radio waves easily penetrate the Milky Way dust and gas;it is a very narrow wavelength,thus its Doppler shift can be used to measure gas motions.

Question 5

Approximately 10% of the mass of the Galaxy is made up of dark matter.

Accepted Answer

A) True 
 B)False

Question 6

What happens when the electron in a hydrogen atom flips its direction of spin,starting parallel to the spin of the proton and ending antiparallel to the spin of the proton?

Accepted Answer

A)  Nothing-this is a forbidden transition and never occurs. 
B)  The atom emits a photon of 656.3 nm wavelength in the red region of the spectrum. 
C)  The atom emits a photon of 121.5 nm wavelength in the UV region of the spectrum. 
D)  The atom emits a photon of 21-cm wavelength in the radio region of the spectrum. 
A)  Nothing-this is a forbidden transition and never occurs. 
B)  The atom emits a photon of 656.3 nm wavelength in the red region of the spectrum. 
C)  The atom emits a photon of 121.5 nm wavelength in the UV region of the spectrum. 
D)  The atom emits a photon of 21-cm wavelength in the radio region of the spectrum.

Question 7

Which of the following,above all else,outlines the spiral arms of a spiral galaxy?

Accepted Answer

A)  The jets that are emitted from the supermassive black hole at the core 
B)  Old,well-established red stars 
C)  Globular clusters in their orbits around the galactic nucleus 
D)  Young stars and associated emission nebulae 
A)  The jets that are emitted from the supermassive black hole at the core 
B)  Old,well-established red stars 
C)  Globular clusters in their orbits around the galactic nucleus 
D)  Young stars and associated emission nebulae

Question 8

Where are the Population I and Population II stars in the Milky Way Galaxy located?

Accepted Answer

The Population I (young,metal-rich)stars

Question 9

What is the difference between grand-design spiral galaxies and flocculent spiral galaxies?

Accepted Answer

Grand design spiral galaxies h

Question 10

Which of the following types of stars are not found in the halo of our Galaxy?

Accepted Answer

A)  O-type stars 
B)  Population II stars 
C)  K-type stars 
D)  M-type stars 
A)  O-type stars 
B)  Population II stars 
C)  K-type stars 
D)  M-type stars

Question 11

What causes the spiral arm structure of spiral galaxies?

Accepted Answer

Density waves,or a wave of increased den

Question 12

Who was the first to look at the Milky Way with a telescope?

Accepted Answer

A)  Johannes Kepler 
B)  Sir William Herschel 
C)  Sir Isaac Newton 
D)  Galileo Galilei 
A)  Johannes Kepler 
B)  Sir William Herschel 
C)  Sir Isaac Newton 
D)  Galileo Galilei

Question 13

The Milky Way is one of myriad

Accepted Answer

A)  solar systems. 
B)  galaxies. 
C)  planets. 
D)  stars. 
A)  solar systems. 
B)  galaxies. 
C)  planets. 
D)  stars.

Question 14

Put the following objects in order of usual size from smaller to larger.

Accepted Answer

A)  Planet,star,globular cluster,galaxy 
B)  Planet,globular cluster,star,galaxy 
C)  Star,planet,galaxy,globular cluster 
D)  Star,planet,globular cluster,galaxy. 
A)  Planet,star,globular cluster,galaxy 
B)  Planet,globular cluster,star,galaxy 
C)  Star,planet,galaxy,globular cluster 
D)  Star,planet,globular cluster,galaxy.

Question 15

In our Galaxy,young metal-rich stars are found

Accepted Answer

A)  in the disk and spiral arms. 
B)  everywhere in the Galaxy. 
C)  only at the galactic center. 
D)  in the globular clusters,in the galactic halo. 
A)  in the disk and spiral arms. 
B)  everywhere in the Galaxy. 
C)  only at the galactic center. 
D)  in the globular clusters,in the galactic halo.

Question 16

Interstellar dust obscures our view of distant regions of space at optical wavelengths.Which of the following statements is TRUE concerning this dust obscuration?

Accepted Answer

A)  Distant regions are severely obscured only in the plane of the Galaxy. 
B)  The obscuration of distant regions of space is roughly uniformly over the whole sky. 
C)  Distant regions are obscured randomly over the whole sky;individual,absorbing dust clouds show no preference for one particular direction or plane. 
D)  Distant regions are obscured the least in the plane of the Galaxy,and are strongest when we look out into the galactic halo,at right angles to this plane. 
A)  Distant regions are severely obscured only in the plane of the Galaxy. 
B)  The obscuration of distant regions of space is roughly uniformly over the whole sky. 
C)  Distant regions are obscured randomly over the whole sky;individual,absorbing dust clouds show no preference for one particular direction or plane. 
D)  Distant regions are obscured the least in the plane of the Galaxy,and are strongest when we look out into the galactic halo,at right angles to this plane.

Question 17

The ratio of thickness to diameter of the Milky Way Galaxy is

Accepted Answer

A)  1/1000. 
B)  1/3. 
C)  1/80. 
D)  1/40. 
A)  1/1000. 
B)  1/3. 
C)  1/80. 
D)  1/40.

Question 18

What is the basic shape of a spiral galaxy?

Accepted Answer

A)  A round,thin disk of uniform brightness with its edges bent up and down into a spiral shape 
B)  A round,flat disk with long lanes of stars that curve outward in a spiral shape from the very center of the galaxy 
C)  Approximately spherical with long lanes of dark dust clouds curving through it in a spiral pattern 
D)  A round,flat disk containing long lanes of stars that curve outward in a spiral shape from the edge of a round,nuclear region of uniform brightness 
A)  A round,thin disk of uniform brightness with its edges bent up and down into a spiral shape 
B)  A round,flat disk with long lanes of stars that curve outward in a spiral shape from the very center of the galaxy 
C)  Approximately spherical with long lanes of dark dust clouds curving through it in a spiral pattern 
D)  A round,flat disk containing long lanes of stars that curve outward in a spiral shape from the edge of a round,nuclear region of uniform brightness

Question 19

Where are the hottest stars in the Galaxy?

Accepted Answer

A)  In the core 
B)  In the disk 
C)  In the halo 
D)  All of these have very hot stars. 
A)  In the core 
B)  In the disk 
C)  In the halo 
D)  All of these have very hot stars.

Question 20

Radio waves of 21-cm wavelength originate from which component of the interstellar medium?

Accepted Answer

A)  Ionized atomic hydrogen 
B)  Neutral atomic hydrogen 
C)  Carbon monoxide,CO 
D)  Molecular hydrogen,H2 
A)  Ionized atomic hydrogen 
B)  Neutral atomic hydrogen 
C)  Carbon monoxide,CO 
D)  Molecular hydrogen,H2

RR Lyrae variable stars are bigger,brighter and have longer periods of pulsation than Cepheid variables.

In a spin-flip transition of an electron,a photon is emitted.

Where would you look in our Galaxy to find older,metal-poor stars?

The major advantage of the measurement of the 21-cm radio emission from hydrogen gas for investigating the spiral structure of our Galaxy is that

Approximately 10% of the mass of the Galaxy is made up of dark matter.

What happens when the electron in a hydrogen atom flips its direction of spin,starting parallel to the spin of the proton and ending antiparallel to the spin of the proton?

Which of the following,above all else,outlines the spiral arms of a spiral galaxy?

Where are the Population I and Population II stars in the Milky Way Galaxy located?

What is the difference between grand-design spiral galaxies and flocculent spiral galaxies?

Which of the following types of stars are not found in the halo of our Galaxy?

What causes the spiral arm structure of spiral galaxies?

Who was the first to look at the Milky Way with a telescope?

The Milky Way is one of myriad

Put the following objects in order of usual size from smaller to larger.

In our Galaxy,young metal-rich stars are found

Interstellar dust obscures our view of distant regions of space at optical wavelengths.Which of the following statements is TRUE concerning this dust obscuration?

The ratio of thickness to diameter of the Milky Way Galaxy is

What is the basic shape of a spiral galaxy?

Where are the hottest stars in the Galaxy?

Radio waves of 21-cm wavelength originate from which component of the interstellar medium?

Predicting the Motions of the Stars, Sun, and Moon

Decoding the Hidden Messages in Starlight

Analyzing Scales and Motions of the Universe

Exploring Our Evolving Solar System

Uncovering Earths Systems

Exploring Terrestrial Surface Processes and Atmospheres

Observing the Dynamic Giant Planets

Looking for Life Beyond Earth

Probing the Dynamic Sun

Observing Properties of Distant Stars

Inferring Patterns in Star Life Cycles

Predicting the Violent End of the Largest Stars

Investigating Other Galaxies

Observing the Evolution of the Universe

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Exam 13: Exploring Our Galaxy

RR Lyrae variable stars are bigger,brighter and have longer periods of pulsation than Cepheid variables.

In a spin-flip transition of an electron,a photon is emitted.

Where would you look in our Galaxy to find older,metal-poor stars?

The major advantage of the measurement of the 21-cm radio emission from hydrogen gas for investigating the spiral structure of our Galaxy is that

Approximately 10% of the mass of the Galaxy is made up of dark matter.

What happens when the electron in a hydrogen atom flips its direction of spin,starting parallel to the spin of the proton and ending antiparallel to the spin of the proton?

Which of the following,above all else,outlines the spiral arms of a spiral galaxy?

Where are the Population I and Population II stars in the Milky Way Galaxy located?

What is the difference between grand-design spiral galaxies and flocculent spiral galaxies?

Which of the following types of stars are not found in the halo of our Galaxy?

What causes the spiral arm structure of spiral galaxies?

Who was the first to look at the Milky Way with a telescope?

The Milky Way is one of myriad

Put the following objects in order of usual size from smaller to larger.

In our Galaxy,young metal-rich stars are found

Interstellar dust obscures our view of distant regions of space at optical wavelengths.Which of the following statements is TRUE concerning this dust obscuration?

The ratio of thickness to diameter of the Milky Way Galaxy is

What is the basic shape of a spiral galaxy?

Where are the hottest stars in the Galaxy?

Radio waves of 21-cm wavelength originate from which component of the interstellar medium?

Predicting the Motions of the Stars, Sun, and Moon

Decoding the Hidden Messages in Starlight

Analyzing Scales and Motions of the Universe

Exploring Our Evolving Solar System

Uncovering Earths Systems

Exploring Terrestrial Surface Processes and Atmospheres

Observing the Dynamic Giant Planets

Looking for Life Beyond Earth

Probing the Dynamic Sun

Observing Properties of Distant Stars

Inferring Patterns in Star Life Cycles

Predicting the Violent End of the Largest Stars

Investigating Other Galaxies

Observing the Evolution of the Universe

Filters