Question 1

Heavy metals from the expulsion of elements in a supernova explosion can be recycled into new stars,which makes them metal-rich.

Accepted Answer

A) True 
 B)False

Question 2

Emission nebulae are glowing,ionized clouds of gas,powered by ultraviolet light that they absorb from nearby hot stars.

Accepted Answer

A) True 
 B)False

Question 3

A star first reaches the main sequence when it

Accepted Answer

A)  starts to collapse. 
B)  becomes a protostar. 
C)  becomes a T Tauri star. 
D)  attains hydrostatic equilibrium. 
A)  starts to collapse. 
B)  becomes a protostar. 
C)  becomes a T Tauri star. 
D)  attains hydrostatic equilibrium.

Question 4

New stars are formed

Accepted Answer

A)  in huge,cool dust and gas clouds. 
B)  from free space,out of pure energy. 
C)  within supernova remnants. 
D)  by condensation of gas near black holes in the centers of galaxies. 
A)  in huge,cool dust and gas clouds. 
B)  from free space,out of pure energy. 
C)  within supernova remnants. 
D)  by condensation of gas near black holes in the centers of galaxies.

Question 5

The study of stars in clusters has helped astronomers to understand

Accepted Answer

A)  the reason for differences in surface temperatures of stars. 
B)  the mechanism of mass loss in stars. 
C)  the action of nuclear fusion in stars. 
D)  stellar evolution-the development of stars with time. 
A)  the reason for differences in surface temperatures of stars. 
B)  the mechanism of mass loss in stars. 
C)  the action of nuclear fusion in stars. 
D)  stellar evolution-the development of stars with time.

Question 6

An asymptotic giant branch (AGB)star is a

Accepted Answer

A)  star in its first red-giant phase. 
B)  blue supergiant. 
C)  cool main-sequence star. 
D)  red supergiant. 
A)  star in its first red-giant phase. 
B)  blue supergiant. 
C)  cool main-sequence star. 
D)  red supergiant.

Question 7

When a star leaves the main sequence and expands toward the red-giant region,what is happening inside the star?

Accepted Answer

A)  Hydrogen burning is taking place in a spherical shell just outside the core;the core itself is almost pure helium. 
B)  Hydrogen burning is taking place in a spherical shell just outside the core;the core has not yet started thermonuclear reactions and is still mostly hydrogen. 
C)  Helium burning is taking place in a spherical shell just outside the core;the core itself is almost pure carbon and oxygen. 
D)  Helium is being converted into carbon and oxygen in the core. 
A)  Hydrogen burning is taking place in a spherical shell just outside the core;the core itself is almost pure helium. 
B)  Hydrogen burning is taking place in a spherical shell just outside the core;the core has not yet started thermonuclear reactions and is still mostly hydrogen. 
C)  Helium burning is taking place in a spherical shell just outside the core;the core itself is almost pure carbon and oxygen. 
D)  Helium is being converted into carbon and oxygen in the core.

Question 8

How do massive protostars (4 solar masses)evolve on the H-R diagram?

Accepted Answer

A)  Temperature decreases at approximately constant luminosity. 
B)  Temperature increases at approximately constant luminosity. 
C)  Luminosity decreases at approximately constant temperature. 
D)  Luminosity increases at approximately constant temperature 
A)  Temperature decreases at approximately constant luminosity. 
B)  Temperature increases at approximately constant luminosity. 
C)  Luminosity decreases at approximately constant temperature. 
D)  Luminosity increases at approximately constant temperature

Question 9

A particular giant molecular cloud has a mass of 400,000 solar masses.What is the mass of hydrogen in this cloud?

Accepted Answer

A)  100,000 solar masses 
B)  4000 solar masses 
C)  392,000 solar masses 
D)  300,000 solar masses 
A)  100,000 solar masses 
B)  4000 solar masses 
C)  392,000 solar masses 
D)  300,000 solar masses

Question 10

Stars join the main-sequence group when they

Accepted Answer

A)  turn into a white dwarf. 
B)  start emitting a planetary nebula. 
C)  begin hydrogen fusion in their cores. 
D)  deplete their core hydrogen. 
A)  turn into a white dwarf. 
B)  start emitting a planetary nebula. 
C)  begin hydrogen fusion in their cores. 
D)  deplete their core hydrogen.

Question 11

Astronomers have to piece together the evolutionary history of stars by studying different stars at different stages in their life cycles.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following stars are metal-poor?

Accepted Answer

A)  Very young stars 
B)  Population II stars 
C)  Population I stars 
D)  Open-cluster stars 
A)  Very young stars 
B)  Population II stars 
C)  Population I stars 
D)  Open-cluster stars

Question 13

What event occurs at the end of the protostar stage of a star's life?

Accepted Answer

A)  Nuclear reactions begin in its core,converting hydrogen into helium,generating energy and increasing internal pressure. 
B)  It explodes,forming a supernova remnant. 
C)  It begins a long period of contraction,in which gravitational energy is converted into heat. 
D)  Gas is spun off from its equator,forming planets. 
A)  Nuclear reactions begin in its core,converting hydrogen into helium,generating energy and increasing internal pressure. 
B)  It explodes,forming a supernova remnant. 
C)  It begins a long period of contraction,in which gravitational energy is converted into heat. 
D)  Gas is spun off from its equator,forming planets.

Question 14

A star's evolutionary track is

Accepted Answer

A)  its movement when plotted on a Hertzsprung-Russell diagram,as it evolves in luminosity and temperature. 
B)  its motion through the dark,dense cloud from which it was formed,marked by a visible channel swept free of dust and gas. 
C)  the line across the Hertzsprung-Russell diagram denoting stars identified as main-sequence stars. 
D)  its movement when plotted on a map of the galaxy as it takes part in the overall galactic rotation. 
A)  its movement when plotted on a Hertzsprung-Russell diagram,as it evolves in luminosity and temperature. 
B)  its motion through the dark,dense cloud from which it was formed,marked by a visible channel swept free of dust and gas. 
C)  the line across the Hertzsprung-Russell diagram denoting stars identified as main-sequence stars. 
D)  its movement when plotted on a map of the galaxy as it takes part in the overall galactic rotation.

Question 15

What are the main general features that make clusters of stars useful to astronomers?

Accepted Answer

A)  The stars are at the same distance from Earth,were formed at approximately the same time,and were made from the same chemical mix. 
B)  The stars are all at the same distance from Earth,have the same surface temperature,and joined the cluster at various times. 
C)  The stars all have the same apparent magnitude,the same surface temperatures,and the same sizes. 
D)  The stars all have the same intrinsic brightness but differ in size and surface temperature. 
A)  The stars are at the same distance from Earth,were formed at approximately the same time,and were made from the same chemical mix. 
B)  The stars are all at the same distance from Earth,have the same surface temperature,and joined the cluster at various times. 
C)  The stars all have the same apparent magnitude,the same surface temperatures,and the same sizes. 
D)  The stars all have the same intrinsic brightness but differ in size and surface temperature.

Question 16

A planetary nebula is

Accepted Answer

A)  the spherical cloud of hot gas produced by a supernova explosion. 
B)  the disk of material in which planets are forming around a star other than the Sun. 
C)  a shell of ejected gases,glowing by fluorescence caused by ultraviolet light from a hot but dying central star. 
D)  a gas cloud surrounding a planet after its formation and before the formation of the planet's moons. 
A)  the spherical cloud of hot gas produced by a supernova explosion. 
B)  the disk of material in which planets are forming around a star other than the Sun. 
C)  a shell of ejected gases,glowing by fluorescence caused by ultraviolet light from a hot but dying central star. 
D)  a gas cloud surrounding a planet after its formation and before the formation of the planet's moons.

Question 17

A particular giant molecular cloud has a mass of 400,000 solar masses.What is the mass of helium in this cloud?

Accepted Answer

A)  4000 solar masses 
B)  300,000 solar masses 
C)  392,000 solar masses 
D)  100,000 solar masses 
A)  4000 solar masses 
B)  300,000 solar masses 
C)  392,000 solar masses 
D)  100,000 solar masses

Question 18

Which type of star would live the longest?

Accepted Answer

A)  K 
B)  B 
C)  A 
D)  F 
A)  K 
B)  B 
C)  A 
D)  F

Question 19

It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium.

Accepted Answer

A) True 
 B)False

Question 20

What causes a helium flash?

Accepted Answer

Precisely how helium fusion begins at a

Heavy metals from the expulsion of elements in a supernova explosion can be recycled into new stars,which makes them metal-rich.

Emission nebulae are glowing,ionized clouds of gas,powered by ultraviolet light that they absorb from nearby hot stars.

A star first reaches the main sequence when it

New stars are formed

The study of stars in clusters has helped astronomers to understand

An asymptotic giant branch (AGB)star is a

When a star leaves the main sequence and expands toward the red-giant region,what is happening inside the star?

How do massive protostars (4 solar masses)evolve on the H-R diagram?

A particular giant molecular cloud has a mass of 400,000 solar masses.What is the mass of hydrogen in this cloud?

Stars join the main-sequence group when they

Astronomers have to piece together the evolutionary history of stars by studying different stars at different stages in their life cycles.

Which of the following stars are metal-poor?

What event occurs at the end of the protostar stage of a star's life?

A star's evolutionary track is

What are the main general features that make clusters of stars useful to astronomers?

A planetary nebula is

A particular giant molecular cloud has a mass of 400,000 solar masses.What is the mass of helium in this cloud?

Which type of star would live the longest?

It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium.

What causes a helium flash?

Predicting the Motions of the Stars, Sun, and Moon

Decoding the Hidden Messages in Starlight

Analyzing Scales and Motions of the Universe

Exploring Our Evolving Solar System

Uncovering Earths Systems

Exploring Terrestrial Surface Processes and Atmospheres

Observing the Dynamic Giant Planets

Looking for Life Beyond Earth

Probing the Dynamic Sun

Observing Properties of Distant Stars

Predicting the Violent End of the Largest Stars

Exploring Our Galaxy

Investigating Other Galaxies

Observing the Evolution of the Universe

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Exam 11: Inferring Patterns in Star Life Cycles

Heavy metals from the expulsion of elements in a supernova explosion can be recycled into new stars,which makes them metal-rich.

Emission nebulae are glowing,ionized clouds of gas,powered by ultraviolet light that they absorb from nearby hot stars.

A star first reaches the main sequence when it

New stars are formed

The study of stars in clusters has helped astronomers to understand

An asymptotic giant branch (AGB)star is a

When a star leaves the main sequence and expands toward the red-giant region,what is happening inside the star?

How do massive protostars (4 solar masses)evolve on the H-R diagram?

A particular giant molecular cloud has a mass of 400,000 solar masses.What is the mass of hydrogen in this cloud?

Stars join the main-sequence group when they

Astronomers have to piece together the evolutionary history of stars by studying different stars at different stages in their life cycles.

Which of the following stars are metal-poor?

What event occurs at the end of the protostar stage of a star's life?

A star's evolutionary track is

What are the main general features that make clusters of stars useful to astronomers?

A planetary nebula is

A particular giant molecular cloud has a mass of 400,000 solar masses.What is the mass of helium in this cloud?

Which type of star would live the longest?

It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium.

What causes a helium flash?

Predicting the Motions of the Stars, Sun, and Moon

Decoding the Hidden Messages in Starlight

Analyzing Scales and Motions of the Universe

Exploring Our Evolving Solar System

Uncovering Earths Systems

Exploring Terrestrial Surface Processes and Atmospheres

Observing the Dynamic Giant Planets

Looking for Life Beyond Earth

Probing the Dynamic Sun

Observing Properties of Distant Stars

Predicting the Violent End of the Largest Stars

Exploring Our Galaxy

Investigating Other Galaxies

Observing the Evolution of the Universe

Filters