Question 1

Of the two colors shown in the image above, the pink colored nebula is the least common.

Accepted Answer

A) True 
 B)False  False

Question 2

What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer.

Accepted Answer

A)  1.8 × 1011 years 
B)  1.8 × 1010 years 
C)  1.8 × 108 years 
D)  1.8 × 106 years 
E)  1.8 × 103 years 
A)  1.8 × 1011 years 
B)  1.8 × 1010 years 
C)  1.8 × 108 years 
D)  1.8 × 106 years 
E)  1.8 × 103 years C

Question 3

Why are distant stars redder than nearby stars of the same spectral type?

Accepted Answer

Interstellar reddening makes stars seen through a cloud of gas and dust look redder than they should because shorter wavelength light is more easily scattered.

Question 4

Which of the following is a method of energy transport?

Accepted Answer

A)  convection 
B)  radiation 
C)  conduction 
D)  All of the other choices are correct. 
A)  convection 
B)  radiation 
C)  conduction 
D)  All of the other choices are correct.

Question 5

How long can a four-solar-mass star live?

Accepted Answer

A)  1 solar lifetime 
B)  0.03125 solar lifetimes 
C)  3 solar lifetimes 
D)  None of the other choices are correct. 
A)  1 solar lifetime 
B)  0.03125 solar lifetimes 
C)  3 solar lifetimes 
D)  None of the other choices are correct.

Question 6

Star clusters are important to the study the stellar evolution because stars in a given cluster have the same

Accepted Answer

A)  temperature. 
B)  mass. 
C)  age. 
D)  luminosity. 
A)  temperature. 
B)  mass. 
C)  age. 
D)  luminosity.

Question 7

The lowest-mass object that can initiate thermonuclear fusion of hydrogen has a mass of about

Accepted Answer

A)  1 solar masses. 
B)  80 solar masses. 
C)  8 solar masses. 
D)  0.08 solar masses. 
E)  0.001 solar masses. 
A)  1 solar masses. 
B)  80 solar masses. 
C)  8 solar masses. 
D)  0.08 solar masses. 
E)  0.001 solar masses.

Question 8

Ninety percent of all stars fuse helium to form carbon and lie on the main sequence.

Accepted Answer

A) True 
 B)False

Question 9

The visual wavelength image shown above is an object that is found in and near star-forming regions.

Accepted Answer

A) True 
 B)False

Question 10

____________________ appear reddish in color due to the light emitted by the Balmer series of the hydrogen atom.

Accepted Answer

Emission n

Question 11

In the above image, the blue color is from a/an ____________ nebula whereas the pink color is from a/an ___________ nebula.

Accepted Answer

A)  dark, reflection 
B)  reflection, emission 
C)  emission, dark 
D)  emission, reflection 
A)  dark, reflection 
B)  reflection, emission 
C)  emission, dark 
D)  emission, reflection

Question 12

Some young star clusters contain large numbers of protostars.

Accepted Answer

A) True 
 B)False

Question 13

You would use the 21-cm radio emission line to map out ____________.

Accepted Answer

A)  the interstellar medium 
B)  molecular clouds 
C)  atomic hydrogen clouds 
D)  All of the other choices are correct. 
A)  the interstellar medium 
B)  molecular clouds 
C)  atomic hydrogen clouds 
D)  All of the other choices are correct.

Question 14

Why is a brown dwarf not considered a star?

Accepted Answer

​ A brown dwarf is an object w

Question 15

Interstellar gas clouds may collapse to form stars if they

Accepted Answer

A)  have very high temperatures. 
B)  encounter a shock wave. 
C)  rotate rapidly. 
D)  are located near main sequence spectral type K and M stars. 
E)  All of the other choices are correct. 
A)  have very high temperatures. 
B)  encounter a shock wave. 
C)  rotate rapidly. 
D)  are located near main sequence spectral type K and M stars. 
E)  All of the other choices are correct.

Question 16

The above image shows stars behind a cloud.

Accepted Answer

A) True 
 B)False

Question 17

_____________ do not have enough mass to sustain nuclear fusion in its core but are more massive than planets.

Accepted Answer

The answer of _____________ do not have enough mass to...

Question 18

Star may appear fainter due to the interstellar medium. This effect is known as ____________________.

Accepted Answer

A)  interstellar reddening 
B)  interstellar extinction 
C)  interstellar absorption line 
D)  interstellar dust 
A)  interstellar reddening 
B)  interstellar extinction 
C)  interstellar absorption line 
D)  interstellar dust

Question 19

A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?

Accepted Answer

A)  20,000 pc 
B)  20,000 AU 
C)  20, 000 ly 
D)  20,000 miles 
E)  20,000 km 
A)  20,000 pc 
B)  20,000 AU 
C)  20, 000 ly 
D)  20,000 miles 
E)  20,000 km

Question 20

The H-R diagram of a young star cluster shows

Accepted Answer

A)  that high-mass stars have not yet reached the main sequence yet. 
B)  that low-mass stars have not yet reached the main sequence yet. 
C)  mainly giant stars. 
D)  no stars since none have reached the main sequence yet. 
A)  that high-mass stars have not yet reached the main sequence yet. 
B)  that low-mass stars have not yet reached the main sequence yet. 
C)  mainly giant stars. 
D)  no stars since none have reached the main sequence yet.

Of the two colors shown in the image above, the pink colored nebula is the least common.

What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer.

Why are distant stars redder than nearby stars of the same spectral type?

Which of the following is a method of energy transport?

How long can a four-solar-mass star live?

Star clusters are important to the study the stellar evolution because stars in a given cluster have the same

The lowest-mass object that can initiate thermonuclear fusion of hydrogen has a mass of about

Ninety percent of all stars fuse helium to form carbon and lie on the main sequence.

The visual wavelength image shown above is an object that is found in and near star-forming regions.

____________________ appear reddish in color due to the light emitted by the Balmer series of the hydrogen atom.

In the above image, the blue color is from a/an __ nebula whereas the pink color is from a/an _ nebula.

Some young star clusters contain large numbers of protostars.

You would use the 21-cm radio emission line to map out ____________.

Why is a brown dwarf not considered a star?

Interstellar gas clouds may collapse to form stars if they

The above image shows stars behind a cloud.

_____________ do not have enough mass to sustain nuclear fusion in its core but are more massive than planets.

Star may appear fainter due to the interstellar medium. This effect is known as ____________________.

A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?

The H-R diagram of a young star cluster shows

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 9: The Formation and Structure of Stars

Of the two colors shown in the image above, the pink colored nebula is the least common.

What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer.

Why are distant stars redder than nearby stars of the same spectral type?

Which of the following is a method of energy transport?

How long can a four-solar-mass star live?

Star clusters are important to the study the stellar evolution because stars in a given cluster have the same

The lowest-mass object that can initiate thermonuclear fusion of hydrogen has a mass of about

Ninety percent of all stars fuse helium to form carbon and lie on the main sequence.

The visual wavelength image shown above is an object that is found in and near star-forming regions.

____________________ appear reddish in color due to the light emitted by the Balmer series of the hydrogen atom.

In the above image, the blue color is from a/an ____________ nebula whereas the pink color is from a/an ___________ nebula.

Some young star clusters contain large numbers of protostars.

You would use the 21-cm radio emission line to map out ____________.

Why is a brown dwarf not considered a star?

Interstellar gas clouds may collapse to form stars if they

The above image shows stars behind a cloud.

_____________ do not have enough mass to sustain nuclear fusion in its core but are more massive than planets.

Star may appear fainter due to the interstellar medium. This effect is known as ____________________.

A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?

The H-R diagram of a young star cluster shows

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

In the above image, the blue color is from a/an __ nebula whereas the pink color is from a/an _ nebula.