Question 1

During a protostar's T Tauri phase, it:

Accepted Answer

A)  begins a period of reduced activity.
B)  expands dramatically.
C)  lies on the main sequence.
D)  may develop very strong winds.
E)  changes its spin direction.

Question 2

Most stars in the Milky Way probably formed:

Accepted Answer

A)  alone.
B)  in intergalactic space, then were swept up into the Galaxy.
C)  in clusters in the Galaxy's spiral arms.
D)  from planetary nebulae.
E)  in the galactic Nucleus, then migrated outward later.

Question 3

During the Kelvin-Helmholtz contraction phase, a protostar has a much ________ brightnessas compared to the Sun.

Accepted Answer

The answer of During the Kelvin-Helmholtz contraction phase, a protostar...

Question 4

Objects which have contracted, but are of too little mass to establish thermonuclear reactionsin their cores, are ________, which slowly continue to cool.

Accepted Answer

The answer of Objects which have contracted, but are of...

Question 5

Most stars in our part of the Galaxy are formed:

Accepted Answer

A)  alone.
B)  in open clusters of a few dozen.
C)  in associations of thousands of stars across a spiral arm of the Galaxy.
D)  in globular clusters of millions of stars.
E)  in a singular event just after the Big Bang.

Question 6

To deduce the interior conditions of the dense regions in which stars form, it is necessary forastronomers to observe in the ________ part of the spectrum.

Accepted Answer

The answer of To deduce the interior conditions of the...

Question 7

Collisions between galaxies tend to destroy, not create, stars.

Accepted Answer

A) True 
 B)False

Question 8

Rotation causes the cocoon of dust to flatten into a dusty disk around protostars.

Accepted Answer

A) True 
 B)False

Question 9

How long does it take an O-type star to form, compared to the time for a solar-type star toform?

Accepted Answer

A)  1/300 as long
B)  1/30 as long
C)  about the same time
D)  30 times longer
E)  300 times longer

Question 10

After stage 3 in star formation, the protostar develops a surface better known as a(n)________.

Accepted Answer

The answer of After stage 3 in star formation, the...

Question 11

Why does the term "planet" have a different meaning when applied to brown dwarfs than inour solar system?

Accepted Answer

In our solar system, a planet is a large...

Question 12

What do we mean by the term "molecular clouds"? Why do they exist? How can observationof their properties yield clues to the processes of stellar formation?

Accepted Answer

Molecular clouds are very cool interstel...

Question 13

More massive stars are able to form in a(n)________ time than less massive stars.

Accepted Answer

The answer of More massive stars are able to form...

Question 14

Our Sun, along with most of the stars in our neighborhood, probably formed:

Accepted Answer

A)  a few million years ago.
B)  about 10 million years ago.
C)  hundreds of millions of years ago.
D)  billions of years ago.
E)  at the beginning of the universe.

Question 15

A cloud fragment too small to collapse into a main sequence star becomes a:

Accepted Answer

A)  white dwarf.
B)  pulsar.
C)  T Tauri object.
D)  brown dwarf.
E)  planet of another star.

Question 16

Type M stars evolve to the main sequence faster than our G type Sun.

Accepted Answer

A) True 
 B)False

Question 17

What is the force that keeps a main sequence star from blowing apart?

Accepted Answer

A)  magnetism
B)  gravitation
C)  the strong force
D)  radiation pressure
E)  electron degeneration pressure

Question 18

A protostar develops a bipolar flow of gas when it is still surrounded by an equatorial disk of________.

Accepted Answer

The answer of A protostar develops a bipolar flow of...

Question 19

Stage 4 of star formation is when the object can exhibit violent surface activity producingextremely strong protostellar winds. This phase is also called the:

Accepted Answer

A)  protostar phase.
B)  Herbig-Haro phase.
C)  brown dwarf phase.
D)  T Tauri phase.
E)  protoplanetary nebula phase.

Question 20

A newly formed protostar will radiate primarily at which wavelength?

Accepted Answer

A)  visible light
B)  X-ray
C)  infrared
D)  ultraviolet
E)  radio

Exam 19: Star Formation: a Traumatic Birth

Objects which have contracted, but are of too little mass to establish thermonuclear reactionsin their cores, are ________, which slowly continue to cool.

Correct AnswerverifiedShow Answer

Most stars in our part of the Galaxy are formed:

Correct AnswerverifiedShow Answer

To deduce the interior conditions of the dense regions in which stars form, it is necessary forastronomers to observe in the ________ part of the spectrum.

Correct AnswerverifiedShow Answer

Type M stars evolve to the main sequence faster than our G type Sun.

Correct AnswerverifiedShow Answer

Most stars in the Milky Way probably formed:

Correct AnswerverifiedShow Answer

How long does it take an O-type star to form, compared to the time for a solar-type star toform?

Correct AnswerverifiedShow Answer

During the Kelvin-Helmholtz contraction phase, a protostar has a much ________ brightnessas compared to the Sun.

Correct AnswerverifiedShow Answer

Our Sun, along with most of the stars in our neighborhood, probably formed:

Correct AnswerverifiedShow Answer

A newly formed protostar will radiate primarily at which wavelength?

Correct AnswerverifiedShow Answer

What is the force that keeps a main sequence star from blowing apart?

Correct AnswerverifiedShow Answer

Stage 4 of star formation is when the object can exhibit violent surface activity producingextremely strong protostellar winds. This phase is also called the:

Correct AnswerverifiedShow Answer

Collisions between galaxies tend to destroy, not create, stars.

Correct AnswerverifiedShow Answer

Rotation causes the cocoon of dust to flatten into a dusty disk around protostars.

Correct AnswerverifiedShow Answer

More massive stars are able to form in a(n)________ time than less massive stars.

Correct AnswerverifiedShow Answer

Why does the term "planet" have a different meaning when applied to brown dwarfs than inour solar system?

Correct AnswerverifiedIn our solar system, a planet is a large...View AnswerShow Answer

After stage 3 in star formation, the protostar develops a surface better known as a(n)________.

Correct AnswerverifiedShow Answer

What do we mean by the term "molecular clouds"? Why do they exist? How can observationof their properties yield clues to the processes of stellar formation?

Correct AnswerverifiedMolecular clouds are very cool interstel...View AnswerShow Answer

A cloud fragment too small to collapse into a main sequence star becomes a:

Correct AnswerverifiedShow Answer

During a protostar's T Tauri phase, it:

Correct AnswerverifiedShow Answer

A protostar develops a bipolar flow of gas when it is still surrounded by an equatorial disk of________.

Correct AnswerverifiedShow Answer

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In our solar system, a planet is a large...
View Answer

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Molecular clouds are very cool interstel...
View Answer

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