Question 1

Cosmic rays are:

Accepted Answer

A)  photons with even higher energy than gamma rays 
B)  high-velocity particles produced in novae 
C)  primarily protons with very high energies 
D)  synchrotron emission from strong magnetic fields 
A)  photons with even higher energy than gamma rays 
B)  high-velocity particles produced in novae 
C)  primarily protons with very high energies 
D)  synchrotron emission from strong magnetic fields

Question 2

The Milky Way Galaxy is a(n)__________ galaxy.

Accepted Answer

A)  irregular 
B)  elliptical 
C)  spiral 
D)  lenticular 
A)  irregular 
B)  elliptical 
C)  spiral 
D)  lenticular

Question 3

We observe molecular hydrogen gas (H2)using 21-cm emission.

Accepted Answer

A) True 
 B)False

Question 4

What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars?

Accepted Answer

A)  The rotation curve 
B)  The velocities of the open star clusters 
C)  The number and shape of the spiral arms 
D)  The thickness of the disk 
A)  The rotation curve 
B)  The velocities of the open star clusters 
C)  The number and shape of the spiral arms 
D)  The thickness of the disk

Question 5

Examine the figure below.How does the H-R diagram of the globular star cluster M92 show that its age is very old?

Accepted Answer

There are not any stars hotter

Question 6

The Milky Way has two major spiral arms that emanate from the ends of its bar.

Accepted Answer

A) True 
 B)False

Question 7

The dust in the interstellar medium comes primarily from stellar winds of main-sequence stars.

Accepted Answer

A) True 
 B)False

Question 8

Examine the figure below.How does the H-R diagram of open star cluster NGC 6530 show that its age is very young?

Accepted Answer

There are very hot stars in th

Question 9

An H II region signals the presence of:

Accepted Answer

A)  newly formed stars 
B)  young stars 
C)  O- and B-type stars 
D)  all of the above 
A)  newly formed stars 
B)  young stars 
C)  O- and B-type stars 
D)  all of the above

Question 10

Globular clusters have much higher stellar densities than the local solar neighborhood.

Accepted Answer

A) True 
 B)False

Question 11

Where would we find the stars with the richest abundance of massive elements? Where would we find those with the smallest amounts of massive elements? Why?

Accepted Answer

Stars with the highest abundance of mass

Question 12

Interstellar clouds are:

Accepted Answer

A)  hydrogen gas,condensed out of the interstellar medium,like water clouds in the Earth's atmosphere 
B)  regions where hydrogen tends to be denser than the surrounding gas 
C)  regions where water condenses out of the interstellar medium 
D)  oxygen gas,condensed out of the interstellar medium,like water clouds in the Earth's atmosphere 
A)  hydrogen gas,condensed out of the interstellar medium,like water clouds in the Earth's atmosphere 
B)  regions where hydrogen tends to be denser than the surrounding gas 
C)  regions where water condenses out of the interstellar medium 
D)  oxygen gas,condensed out of the interstellar medium,like water clouds in the Earth's atmosphere

Question 13

Describe the structure of the disk of the Milky Way (figure below).

Accepted Answer

The thin disk contai

Question 14

Sitting in a 100°F hot tub feels much hotter than standing outside on a 100°F day.This analogy illustrates why:

Accepted Answer

A)  interstellar dust is dark at optical wavelengths but bright in the infrared 
B)  supernovae can heat their shells to such high temperatures 
C)  an astronaut would feel cold in the 106 K intercloud gas 
D)  the Solar System is immersed in a hot bubble of gas 
A)  interstellar dust is dark at optical wavelengths but bright in the infrared 
B)  supernovae can heat their shells to such high temperatures 
C)  an astronaut would feel cold in the 106 K intercloud gas 
D)  the Solar System is immersed in a hot bubble of gas

Question 15

Studying standard candles in globular clusters offered the first conclusive proof that our galaxy was much __________ than originally believed.

Accepted Answer

A)  smaller 
B)  rounder 
C)  larger 
D)  flatter 
A)  smaller 
B)  rounder 
C)  larger 
D)  flatter

Question 16

A typical globular cluster (image below)is composed of 500,000 stars in a sphere whose radius is approximately 15 light-years.The distance between stars in a globular cluster is given approximately by d $\approx$r/N1/3,where r is the radius and N is the number of stars in the cluster.Calculate this distance,and determine how many times smaller it is than the typical distance between stars in the solar neighborhood,which is 3 light-years.

Accepted Answer

The typical distance between s

Question 17

Why can the observed chemical abundance of a star tell you something about its age?

Accepted Answer

As a galaxy evolves,gas is converted to

Question 18

Why do we know that at least one generation of stars formed and died before the Milky Way's globular clusters formed?

Accepted Answer

A)  All globular clusters reside in the disk of the Milky Way. 
B)  No globular cluster has zero heavy elements. 
C)  Globular clusters are 9-10 billion years old. 
D)  No globular cluster is older than 12 billion years. 
A)  All globular clusters reside in the disk of the Milky Way. 
B)  No globular cluster has zero heavy elements. 
C)  Globular clusters are 9-10 billion years old. 
D)  No globular cluster is older than 12 billion years.

Question 19

Why do stars form most often within molecular clouds?

Accepted Answer

Because that is wher

Question 20

We detect neutral gas in the interstellar medium by looking for radiation at 21 cm that arises when:

Accepted Answer

A)  an electron moves from the n = 1 to n = 2 state in a hydrogen atom 
B)  an electron is ionized from a hydrogen atom 
C)  carbon monoxide (CO)gas is excited by stellar radiation 
D)  the spin of an electron flips and aligns with the spin of a proton in a hydrogen atom 
A)  an electron moves from the n = 1 to n = 2 state in a hydrogen atom 
B)  an electron is ionized from a hydrogen atom 
C)  carbon monoxide (CO)gas is excited by stellar radiation 
D)  the spin of an electron flips and aligns with the spin of a proton in a hydrogen atom

Cosmic rays are:

The Milky Way Galaxy is a(n)__________ galaxy.

We observe molecular hydrogen gas (H₂)using 21-cm emission.

What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars?

Examine the figure below.How does the H-R diagram of the globular star cluster M92 show that its age is very old?

The Milky Way has two major spiral arms that emanate from the ends of its bar.

The dust in the interstellar medium comes primarily from stellar winds of main-sequence stars.

Examine the figure below.How does the H-R diagram of open star cluster NGC 6530 show that its age is very young?

An H II region signals the presence of:

Globular clusters have much higher stellar densities than the local solar neighborhood.

Where would we find the stars with the richest abundance of massive elements? Where would we find those with the smallest amounts of massive elements? Why?

Interstellar clouds are:

Describe the structure of the disk of the Milky Way (figure below).

Sitting in a 100°F hot tub feels much hotter than standing outside on a 100°F day.This analogy illustrates why:

Studying standard candles in globular clusters offered the first conclusive proof that our galaxy was much __________ than originally believed.

Why can the observed chemical abundance of a star tell you something about its age?

Why do we know that at least one generation of stars formed and died before the Milky Way's globular clusters formed?

Why do stars form most often within molecular clouds?

We detect neutral gas in the interstellar medium by looking for radiation at 21 cm that arises when:

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Expansion of Space

The Realm of the Galaxies

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

Exam 16: Our Galaxy: The Milky Way

Cosmic rays are:

The Milky Way Galaxy is a(n)__________ galaxy.

We observe molecular hydrogen gas (H2)using 21-cm emission.

What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars?

Examine the figure below.How does the H-R diagram of the globular star cluster M92 show that its age is very old?

The Milky Way has two major spiral arms that emanate from the ends of its bar.

The dust in the interstellar medium comes primarily from stellar winds of main-sequence stars.

Examine the figure below.How does the H-R diagram of open star cluster NGC 6530 show that its age is very young?

An H II region signals the presence of:

Globular clusters have much higher stellar densities than the local solar neighborhood.

Where would we find the stars with the richest abundance of massive elements? Where would we find those with the smallest amounts of massive elements? Why?

Interstellar clouds are:

Describe the structure of the disk of the Milky Way (figure below).

Sitting in a 100°F hot tub feels much hotter than standing outside on a 100°F day.This analogy illustrates why:

Studying standard candles in globular clusters offered the first conclusive proof that our galaxy was much __________ than originally believed.

Why can the observed chemical abundance of a star tell you something about its age?

Why do we know that at least one generation of stars formed and died before the Milky Way's globular clusters formed?

Why do stars form most often within molecular clouds?

We detect neutral gas in the interstellar medium by looking for radiation at 21 cm that arises when:

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Expansion of Space

The Realm of the Galaxies

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

We observe molecular hydrogen gas (H₂)using 21-cm emission.