Question 1

A hypernova is a gamma- ray burster that forms a black hole as well.

Accepted Answer

A) True 
 B)False  True

Question 2

Which are the two most popular candidates for gamma- ray bursters?

Accepted Answer

A)  mergers of two black holes, and merger of a neutron star and a white dwarf 
B)  collisions between a white dwarf and a giant, and merger of two neutron stars 
C)  formation of uranium in the core of a supergiant, and collisions of white dwarfs 
D)  hypernova making pulsars, and mergers of two white dwarfs 
E)  hypernova making a black hole, and merger of two neutron stars 
A)  mergers of two black holes, and merger of a neutron star and a white dwarf 
B)  collisions between a white dwarf and a giant, and merger of two neutron stars 
C)  formation of uranium in the core of a supergiant, and collisions of white dwarfs 
D)  hypernova making pulsars, and mergers of two white dwarfs 
E)  hypernova making a black hole, and merger of two neutron stars E

Question 3

Millisecond pulsars are never members of close binary systems.

Accepted Answer

A) True 
 B)False  False

Question 4

Why is the light from near a black hole redshifted?

Accepted Answer

The gravity is great enough to

Question 5

A proposed explanation for gamma- ray bursters is

Accepted Answer

A)  coalescence of a neutron star binary. 
B)  hypernova- making black holes and bipolar jets. 
C)  collisions between two white dwarfs. 
D)  Both A and B are possible. 
E)  All three are possible. 
A)  coalescence of a neutron star binary. 
B)  hypernova- making black holes and bipolar jets. 
C)  collisions between two white dwarfs. 
D)  Both A and B are possible. 
E)  All three are possible.

Question 6

Geminga pulses strongly in gamma rays, and may be the closest neutron star. Why is it unusual?

Accepted Answer

It gives off no observed radio

Question 7

A neutron star rapidly.

Accepted Answer

The answer of A neutron star rapidly....

Question 8

The supernova that created the Crab nebula and its pulsar was seen on Earth in the year

Accepted Answer

A)  1604 BC. 
B)  1054 BC. 
C)  1054 AD. 
D)  1592 AD. 
E)  1604 AD. 
A)  1604 BC. 
B)  1054 BC. 
C)  1054 AD. 
D)  1592 AD. 
E)  1604 AD.

Question 9

As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that

Accepted Answer

A)  its length will decrease and its clock will run more slowly. 
B)  its length will decrease and its clock will run faster. 
C)  its length will increase and its clock will run more slowly. 
D)  its length will increase and its clock will run faster. 
E)  None of these will happen. 
A)  its length will decrease and its clock will run more slowly. 
B)  its length will decrease and its clock will run faster. 
C)  its length will increase and its clock will run more slowly. 
D)  its length will increase and its clock will run faster. 
E)  None of these will happen.

Question 10

Type supernovae produce no neutron stars, only ejected debris.

Accepted Answer

The answer of Type supernovae produce no neutron stars, only...

Question 11

A neutron star detectable by its rapid rotation and strong magnetic field is a(n) .

Accepted Answer

The answer of A neutron star detectable by its rapid...

Question 12

Two important properties of young neutron stars are

Accepted Answer

A)  extremely slow rotation and a strong magnetic field. 
B)  extremely rapid rotation and a strong magnetic field. 
C)  extremely rapid rotation and a weak magnetic field. 
D)  no rotation and a weak magnetic field. 
E)  no rotation and no magnetic field. 
A)  extremely slow rotation and a strong magnetic field. 
B)  extremely rapid rotation and a strong magnetic field. 
C)  extremely rapid rotation and a weak magnetic field. 
D)  no rotation and a weak magnetic field. 
E)  no rotation and no magnetic field.

Question 13

The hypernova model is one possible explanation for _.

Accepted Answer

The answer of The hypernova model is one possible explanation...

Question 14

A black hole can be created in a(n) , even more violent than supernovae.

Accepted Answer

The answer of A black hole can be created in...

Question 15

The burst of X- rays from an X- ray burster is due to _ of hydrogen on its surface.

Accepted Answer

The answer of The burst of X- rays from an...

Question 16

What does it take to allow us to observe a neutron star as a pulsar?

Accepted Answer

The neutron star must be still spinning

Question 17

Most pulsars are known only as radio sources, but a few of the younger ones, like the Crab and Vela, also give off visible and even X- ray energy.

Accepted Answer

A) True 
 B)False

Question 18

What makes the Crab Nebula pulsar unusual among other pulsars?

Accepted Answer

A)  It is a magnetar, with far more intense magnetic fields than any other. 
B)  Its period is much less regular than other pulsars. 
C)  It is the fastest spinning known pulsar. 
D)  It is relatively bright in shorter wavelengths, like visible and X- rays. 
E)  It is the oldest known pulsar. 
A)  It is a magnetar, with far more intense magnetic fields than any other. 
B)  Its period is much less regular than other pulsars. 
C)  It is the fastest spinning known pulsar. 
D)  It is relatively bright in shorter wavelengths, like visible and X- rays. 
E)  It is the oldest known pulsar.

Question 19

Pulsars are created in a Type I supernova.

Accepted Answer

A) True 
 B)False

Question 20

Even if a probe were in a stable orbit near a black hole, we would still observe its signals redshifted by the gravitational field of the black hole.

Accepted Answer

A) True 
 B)False

A hypernova is a gamma- ray burster that forms a black hole as well.

Which are the two most popular candidates for gamma- ray bursters?

Millisecond pulsars are never members of close binary systems.

Why is the light from near a black hole redshifted?

A proposed explanation for gamma- ray bursters is

Geminga pulses strongly in gamma rays, and may be the closest neutron star. Why is it unusual?

A neutron star rapidly.

The supernova that created the Crab nebula and its pulsar was seen on Earth in the year

As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that

Type supernovae produce no neutron stars, only ejected debris.

A neutron star detectable by its rapid rotation and strong magnetic field is a(n) .

Two important properties of young neutron stars are

The hypernova model is one possible explanation for _.

A black hole can be created in a(n) , even more violent than supernovae.

The burst of X- rays from an X- ray burster is due to _ of hydrogen on its surface.

What does it take to allow us to observe a neutron star as a pulsar?

Most pulsars are known only as radio sources, but a few of the younger ones, like the Crab and Vela, also give off visible and even X- ray energy.

What makes the Crab Nebula pulsar unusual among other pulsars?

Pulsars are created in a Type I supernova.

Even if a probe were in a stable orbit near a black hole, we would still observe its signals redshifted by the gravitational field of the black hole.

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

The Interstellar Medium: Star Formation in the Milky Way

Stellar Evolution: the Lives and Deaths of Stars

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

Exam 14: Neutron Stars and Black Holes: Strange States of Matter

A hypernova is a gamma- ray burster that forms a black hole as well.

Which are the two most popular candidates for gamma- ray bursters?

Millisecond pulsars are never members of close binary systems.

Why is the light from near a black hole redshifted?

A proposed explanation for gamma- ray bursters is

Geminga pulses strongly in gamma rays, and may be the closest neutron star. Why is it unusual?

A neutron star rapidly.

The supernova that created the Crab nebula and its pulsar was seen on Earth in the year

As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that

Type supernovae produce no neutron stars, only ejected debris.

A neutron star detectable by its rapid rotation and strong magnetic field is a(n) .

Two important properties of young neutron stars are

The hypernova model is one possible explanation for _.

A black hole can be created in a(n) , even more violent than supernovae.

The burst of X- rays from an X- ray burster is due to _ of hydrogen on its surface.

What does it take to allow us to observe a neutron star as a pulsar?

Most pulsars are known only as radio sources, but a few of the younger ones, like the Crab and Vela, also give off visible and even X- ray energy.

What makes the Crab Nebula pulsar unusual among other pulsars?

Pulsars are created in a Type I supernova.

Even if a probe were in a stable orbit near a black hole, we would still observe its signals redshifted by the gravitational field of the black hole.

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

The Interstellar Medium: Star Formation in the Milky Way

Stellar Evolution: the Lives and Deaths of Stars

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