Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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

Question 4

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

Question 5

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 6

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. 
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 7

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

Question 8

A newly formed protostar will radiate primarily at which wavelength?

Accepted Answer

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

Question 9

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 10

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. 
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 11

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 12

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. 
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 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

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 15

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. 
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 16

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 17

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

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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 20

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...

Exam 19: Star Formation: a Traumatic Birth

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

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

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

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

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

Most stars in the Milky Way probably formed:

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

A newly formed protostar will radiate primarily at which wavelength?

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.

Most stars in our part of the Galaxy are formed:

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

During a protostar's T Tauri phase, it:

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

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?

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

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

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

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

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

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

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information From the Cosmos

Spectroscopy: the Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earths Sister Planet

Mars: a Near Miss for Life

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Gas and Dust Among the Stars

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone

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