Question 1

What is a brown dwarf?

Accepted Answer

A protostar of insufficient mass (less t

Question 2

The gas density in an emission nebula is typically about how many particles per cc?

Accepted Answer

A)  dozen 
B)  hundred 
C)  thousand 
D)  hundred thousand 
E)  million 
A)  dozen 
B)  hundred 
C)  thousand 
D)  hundred thousand 
E)  million

Question 3

Why can radio waves get through the dust clouds, but light is blocked?

Accepted Answer

The interstellar dust grains a

Question 4

Contrast open and globular star clusters.

Accepted Answer

Globular clusters are older (as old as t

Question 5

Light from distant stars that must pass through dust arrives bluer than when it left its star.

Accepted Answer

A) True 
 B)False

Question 6

What are the characteristics of an open cluster of stars?

Accepted Answer

A)  a few hundred, mostly main- sequence stars 
B)  old age and millions of members 
C)  mostly found above and below the galactic plane 
D)  All stars are much more massive than our Sun. 
E)  All stars are about the same age and luminosity. 
A)  a few hundred, mostly main- sequence stars 
B)  old age and millions of members 
C)  mostly found above and below the galactic plane 
D)  All stars are much more massive than our Sun. 
E)  All stars are about the same age and luminosity.

Question 7

Which statement is true about the interstellar medium?

Accepted Answer

A)  Gas obscures the light from distant stars. 
B)  Dust blocks the longest electromagnetic wavelengths. 
C)  Dust is spread uniformly through the galaxy. 
D)  Gas contains a lot of carbon atoms. 
E)  We know more about the gas than the dust. 
A)  Gas obscures the light from distant stars. 
B)  Dust blocks the longest electromagnetic wavelengths. 
C)  Dust is spread uniformly through the galaxy. 
D)  Gas contains a lot of carbon atoms. 
E)  We know more about the gas than the dust.

Question 8

How is dust usually observed around young protostars in stages 4- 6?

Accepted Answer

As the nebula contracts, it fo

Question 9

All globular clusters in our Milky Way are about how old?

Accepted Answer

A)  a variety of ages, from newly born to twenty billions years old 
B)  around ten billion years old 
C)  one to three billion years old 
D)  less than a million years 
E)  ten to fifty million years old 
A)  a variety of ages, from newly born to twenty billions years old 
B)  around ten billion years old 
C)  one to three billion years old 
D)  less than a million years 
E)  ten to fifty million years old

Question 10

Which statement about the stages of starbirth is false?

Accepted Answer

A)  By stage 7, the star has reached the main sequence. 
B)  Nuclear reactions begin in the core by stage 4. 
C)  At stage 1, only the cloud exists. 
D)  By stage 3, the star has formed a photosphere. 
E)  The T- Tauri wind is prevalent in stage 5. 
A)  By stage 7, the star has reached the main sequence. 
B)  Nuclear reactions begin in the core by stage 4. 
C)  At stage 1, only the cloud exists. 
D)  By stage 3, the star has formed a photosphere. 
E)  The T- Tauri wind is prevalent in stage 5.

Question 11

A newly formed protostar will radiate primarily at which wavelength?

Accepted Answer

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

Question 12

How long does it take an M- type star to reach the main sequence, compared to a solar- type star?

Accepted Answer

A)  longer than the age of the Galaxy 
B)  about twice as long 
C)  about the same, 30 million years 
D)  a tenth as long 
E)  about twenty times longer 
A)  longer than the age of the Galaxy 
B)  about twice as long 
C)  about the same, 30 million years 
D)  a tenth as long 
E)  about twenty times longer

Question 13

There is as much mass in the voids between the stars as in the stars themselves.

Accepted Answer

A) True 
 B)False

Question 14

Contrast observation of ionized and neutral hydrogen in space.

Accepted Answer

Emission nebula glow bright red from the

Question 15

Young open clusters contain a lot of hot, young blue- white stars.

Accepted Answer

A) True 
 B)False

Question 16

Dark dust clouds are cooler than their surroundings.

Accepted Answer

A) True 
 B)False

Question 17

A reflection nebula appears blue because it scatters the _ light of the stars near it.

Accepted Answer

blue or sh

Question 18

Compared to a hydrogen atom where the proton and electron both have spin in the same direction, an atom where they spin in opposite directions will have energy.

Accepted Answer

The answer of Compared to a hydrogen atom where the...

Question 19

A star of five solar masses would reach the main sequence much _ _ than our Sun.

Accepted Answer

The answer of A star of five solar masses would...

Question 20

A typical protostar may be several thousand times more luminous than our Sun; where does this energy come from?

Accepted Answer

From the release of

What is a brown dwarf?

The gas density in an emission nebula is typically about how many particles per cc?

Why can radio waves get through the dust clouds, but light is blocked?

Contrast open and globular star clusters.

Light from distant stars that must pass through dust arrives bluer than when it left its star.

What are the characteristics of an open cluster of stars?

Which statement is true about the interstellar medium?

How is dust usually observed around young protostars in stages 4- 6?

All globular clusters in our Milky Way are about how old?

Which statement about the stages of starbirth is false?

A newly formed protostar will radiate primarily at which wavelength?

How long does it take an M- type star to reach the main sequence, compared to a solar- type star?

There is as much mass in the voids between the stars as in the stars themselves.

Contrast observation of ionized and neutral hydrogen in space.

Young open clusters contain a lot of hot, young blue- white stars.

Dark dust clouds are cooler than their surroundings.

A reflection nebula appears blue because it scatters the _ light of the stars near it.

Compared to a hydrogen atom where the proton and electron both have spin in the same direction, an atom where they spin in opposite directions will have energy.

A star of five solar masses would reach the main sequence much _ _ than our Sun.

A typical protostar may be several thousand times more luminous than our Sun; where does this energy come from?

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

Measuring the Stars: Giants, Dwarfs, and the Main Sequence

Stellar Evolution: the Lives and Deaths of Stars

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Normal and Active Galaxies: Building Blocks of the Universe

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

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Exam 12: The Interstellar Medium: Star Formation in the Milky Way

What is a brown dwarf?

The gas density in an emission nebula is typically about how many particles per cc?

Why can radio waves get through the dust clouds, but light is blocked?

Contrast open and globular star clusters.

Light from distant stars that must pass through dust arrives bluer than when it left its star.

What are the characteristics of an open cluster of stars?

Which statement is true about the interstellar medium?

How is dust usually observed around young protostars in stages 4- 6?

All globular clusters in our Milky Way are about how old?

Which statement about the stages of starbirth is false?

A newly formed protostar will radiate primarily at which wavelength?

How long does it take an M- type star to reach the main sequence, compared to a solar- type star?

There is as much mass in the voids between the stars as in the stars themselves.

Contrast observation of ionized and neutral hydrogen in space.

Young open clusters contain a lot of hot, young blue- white stars.

Dark dust clouds are cooler than their surroundings.

A reflection nebula appears blue because it scatters the _ light of the stars near it.

Compared to a hydrogen atom where the proton and electron both have spin in the same direction, an atom where they spin in opposite directions will have energy.

A star of five solar masses would reach the main sequence much _ _ than our Sun.

A typical protostar may be several thousand times more luminous than our Sun; where does this energy come from?

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

Measuring the Stars: Giants, Dwarfs, and the Main Sequence

Stellar Evolution: the Lives and Deaths of Stars

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Normal and Active Galaxies: Building Blocks of the Universe

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

Filters