Question 1

Which of the following molecules is the most abundant species in giant molecular clouds in the Milky Way?

Accepted Answer

A)  H2O 
B)  CO2 
C)  O2 
D)  H2 
A)  H2O 
B)  CO2 
C)  O2 
D)  H2

Question 2

Which of the following adjectives best describes the interstellar medium?

Accepted Answer

A)  ordered 
B)  dense 
C)  smooth 
D)  turbulent 
A)  ordered 
B)  dense 
C)  smooth 
D)  turbulent

Question 3

What is the criterion for a collapsing cloud to become a protostar?

Accepted Answer

The cloud must becom

Question 4

Name two sources for the energy radiated by brown dwarfs.

Accepted Answer

Leftover energy from

Question 5

How are the properties of the densest parts of the interstellar medium measured?

Accepted Answer

A)  gravitational effects 
B)  molecular lines 
C)  Ha emission 
D)  hydrogen 21 centimeter absorption 
A)  gravitational effects 
B)  molecular lines 
C)  Ha emission 
D)  hydrogen 21 centimeter absorption

Question 6

What factor provides a giant molecular cloud's primary support against gravitational collapse?

Accepted Answer

The answer of What factor provides a giant molecular cloud's...

Question 7

Giant molecular clouds are typically:

Accepted Answer

A)  spherical. 
B)  hierarchical, with structure on a wide range of length scales. 
C)  dominated by magnetic fields. 
D)  found in the galactic halo. 
A)  spherical. 
B)  hierarchical, with structure on a wide range of length scales. 
C)  dominated by magnetic fields. 
D)  found in the galactic halo.

Question 8

Which of the following is a key constituent of the interstellar medium?

Accepted Answer

A)  dust only 
B)  gas only 
C)  gas and dust 
D)  Neither gas nor dust, it is a vacuum. 
A)  dust only 
B)  gas only 
C)  gas and dust 
D)  Neither gas nor dust, it is a vacuum.

Question 9

Where do high-mass stars form?

Accepted Answer

A)  in massive clumps 
B)  in small, isolated clumps 
C)  in binary systems 
D)  in globular clusters 
A)  in massive clumps 
B)  in small, isolated clumps 
C)  in binary systems 
D)  in globular clusters

Question 10

As a low-mass protostar approaches the main sequence,its central temperature ________ and its luminosity ________.

Accepted Answer

A)  decreases; decreases 
B)  increases; increases 
C)  remains steady; increases 
D)  increases; decreases 
A)  decreases; decreases 
B)  increases; increases 
C)  remains steady; increases 
D)  increases; decreases

Which of the following molecules is the most abundant species in giant molecular clouds in the Milky Way?

Which of the following adjectives best describes the interstellar medium?

What is the criterion for a collapsing cloud to become a protostar?

Name two sources for the energy radiated by brown dwarfs.

How are the properties of the densest parts of the interstellar medium measured?

What factor provides a giant molecular cloud's primary support against gravitational collapse?

Giant molecular clouds are typically:

Which of the following is a key constituent of the interstellar medium?

Where do high-mass stars form?

As a low-mass protostar approaches the main sequence,its central temperature and its luminosity .

Getting Started: Science, astronomy, and Being Human

A Universe Made, a Universe Discovered

A Universe of Universal Laws

A Universe of Universal Laws

The Architecture and Birth of Planetary Systems

Home Base: Earth and Moon

Sibling Worlds: Mercury, Venus, and Mars

Gas, ice, and Stone: the Outer Planets

Life and the Search for Habitable Worlds

The Sun As a Star

Measuring the Stars: the Main Sequence and Its Meaning

To the Graveyard of Stars: the End Points of Stellar Evolution

Down the Rabbit Hole: Relativity and Black Holes

Our City of Stars: the Milky Way

A Universe of Galaxies

The Cosmic Web: the Large-Scale Structure of the Universe

Cosmology

Filters

Exam 12: Nursery of the Stars: the Interstellar Medium and Star Formation

Which of the following molecules is the most abundant species in giant molecular clouds in the Milky Way?

Which of the following adjectives best describes the interstellar medium?

What is the criterion for a collapsing cloud to become a protostar?

Name two sources for the energy radiated by brown dwarfs.

How are the properties of the densest parts of the interstellar medium measured?

What factor provides a giant molecular cloud's primary support against gravitational collapse?

Giant molecular clouds are typically:

Which of the following is a key constituent of the interstellar medium?

Where do high-mass stars form?

As a low-mass protostar approaches the main sequence,its central temperature ________ and its luminosity ________.

Getting Started: Science, astronomy, and Being Human

A Universe Made, a Universe Discovered

A Universe of Universal Laws

A Universe of Universal Laws

The Architecture and Birth of Planetary Systems

Home Base: Earth and Moon

Sibling Worlds: Mercury, Venus, and Mars

Gas, ice, and Stone: the Outer Planets

Life and the Search for Habitable Worlds

The Sun As a Star

Measuring the Stars: the Main Sequence and Its Meaning

To the Graveyard of Stars: the End Points of Stellar Evolution

Down the Rabbit Hole: Relativity and Black Holes

Our City of Stars: the Milky Way

A Universe of Galaxies

The Cosmic Web: the Large-Scale Structure of the Universe

Cosmology

Filters

As a low-mass protostar approaches the main sequence,its central temperature and its luminosity .