Question 1

Pre-main-sequence stars are above and to the right of the main sequence.

Accepted Answer

A) True 
 B)False

Question 2

-The above visual wavelength image of the Trapezium cluster shows _________.

Accepted Answer

A)  main sequence and protostars
B)  protostars and YSOs
C)  YSOs and ZAMS
D)  ZAMS and protostars

Question 3

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.

Question 4

Why is there a lower end to the main sequence

Accepted Answer

The mass-luminosity relation tells you w...

Question 5

The densest, coldest clouds are called _____________.

Accepted Answer

A)  reflection nebula
B)  dark nebula
C)  Bok globules
D)  molecular clouds

Question 6

The above image is an example of interstellar reddening.

Accepted Answer

A) True 
 B)False

Question 7

The dust in the interstellar medium can make distant stars look redder than they really are.

Accepted Answer

A) True 
 B)False

Question 8

While on the main sequence a star's primary energy source comes from

Accepted Answer

A)  nuclear fusion.
B)  nuclear fission.
C)  gravitational potential energy.
D)  magnetic fields.

Question 9

Protostars are difficult to observe because

Accepted Answer

A)  the protostar stage is very short.
B)  they are surrounded by cocoons of gas and dust.
C)  they radiate mainly in the infrared.
D)  the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
E)  they are all so far away that the light hasn't reached us yet.

Question 10

-The above image is an example of a/an _________ nebula.

Accepted Answer

A)  dark
B)  emission
C)  Bok globule
D)  reflection

Question 11

The central cores of which type of star is the lowest temperature

Accepted Answer

A)  protostars.
B)  massive main-sequence stars.
C)  white dwarf stars.

Question 12

________ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence.

Accepted Answer

A)  The CNO cycle
B)  The proton-proton chain
C)  Hydrostatic equilibrium
D)  The neutrino process
E)  None of the above

Question 13

________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles.

Accepted Answer

A)  An emission nebula
B)  Hydrostatic equilibrium
C)  The proton-proton chain
D)  The thermonuclear fusion of hydrogen
E)  A bipolar outflow

Question 14

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

Accepted Answer

Emission n...

Question 15

Which of the following in not a factor that prevents molecular cloud contraction

Accepted Answer

A)  thermal motion
B)  a force exerted by a magnetic field
C)  orbital motion
D)  turbulence

Question 16

Why are reflection nebulae blue in color

Accepted Answer

Reflection nebulae look blue for the sam...

Exam 9: The Formation and Structure of Stars

________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles.

Correct Answer
verified

Why are reflection nebulae blue in color

Correct Answer
verified
Reflection nebulae look blue for the sam...
View Answer

The above image is an example of interstellar reddening.

Correct Answer
verified

While on the main sequence a star's primary energy source comes from

Correct Answer
verified

The dust in the interstellar medium can make distant stars look redder than they really are.

Correct Answer
verified

Which of the following in not a factor that prevents molecular cloud contraction

Correct Answer
verified

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

Correct Answer
verified
Emission n...
View Answer

Pre-main-sequence stars are above and to the right of the main sequence.

Correct Answer
verified

Why is there a lower end to the main sequence

Correct Answer
verified
The mass-luminosity relation tells you w...
View Answer

-The above visual wavelength image of the Trapezium cluster shows _________.

Correct Answer
verified

The central cores of which type of star is the lowest temperature

Correct Answer
verified

The densest, coldest clouds are called _____________.

Correct Answer
verified

Which of the following is a method of energy transport

Correct Answer
verified

-The above image is an example of a/an _________ nebula.

Correct Answer
verified

________ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence.

Correct Answer
verified

Protostars are difficult to observe because

Correct Answer
verified

Exam 9: The Formation and Structure of Stars

________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles.

Correct AnswerverifiedShow Answer

Why are reflection nebulae blue in color

Correct AnswerverifiedReflection nebulae look blue for the sam...View AnswerShow Answer

The above image is an example of interstellar reddening.

Correct AnswerverifiedShow Answer

While on the main sequence a star's primary energy source comes from

Correct AnswerverifiedShow Answer

The dust in the interstellar medium can make distant stars look redder than they really are.

Correct AnswerverifiedShow Answer

Which of the following in not a factor that prevents molecular cloud contraction

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedEmission n...View AnswerShow Answer

Pre-main-sequence stars are above and to the right of the main sequence.

Correct AnswerverifiedShow Answer

Why is there a lower end to the main sequence

Correct AnswerverifiedThe mass-luminosity relation tells you w...View AnswerShow Answer

-The above visual wavelength image of the Trapezium cluster shows _________.

Correct AnswerverifiedShow Answer

The central cores of which type of star is the lowest temperature

Correct AnswerverifiedShow Answer

The densest, coldest clouds are called _____________.

Correct AnswerverifiedShow Answer

Which of the following is a method of energy transport

Correct AnswerverifiedShow Answer

-The above image is an example of a/an _________ nebula.

Correct AnswerverifiedShow Answer

________ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence.

Correct AnswerverifiedShow Answer

Protostars are difficult to observe because

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Reflection nebulae look blue for the sam...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Emission n...
View Answer

Correct Answer
verified

Correct Answer
verified
The mass-luminosity relation tells you w...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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