Question 1

Gamma-ray bursters are:

Accepted Answer

A) ordinary Type Ic supernovae. 
B) ordinary Type II supernovae. 
C) Type Ic supernovae with jets funneling most of the radiation in two narrow directions. 
D) Type II supernovae with jets funneling most of the radiation in two narrow directions. 
A) ordinary Type Ic supernovae. 
B) ordinary Type II supernovae. 
C) Type Ic supernovae with jets funneling most of the radiation in two narrow directions. 
D) Type II supernovae with jets funneling most of the radiation in two narrow directions.

Question 2

Suppose that a neutron star of 2.8 Mε is part of a binary star system in which the other star is a normal giant star. What would happen if 0.5 Mε of material were transferred onto the neutron star from its companion?

Accepted Answer

A) The neutron star would collapse and become a black hole. 
B) The increased gravitational force would transform the neutrons into quarks, and the neutron star would re-establish equilibrium as a quark star of smaller diameter. 
C) The neutron degeneracy pressure inside the neutron star would increase to balance the increased gravitational force within the neutron star. 
D) The neutron star would explode as a supernova. 
A) The neutron star would collapse and become a black hole. 
B) The increased gravitational force would transform the neutrons into quarks, and the neutron star would re-establish equilibrium as a quark star of smaller diameter. 
C) The neutron degeneracy pressure inside the neutron star would increase to balance the increased gravitational force within the neutron star. 
D) The neutron star would explode as a supernova.

Question 3

What event is now known to be a source of short GRBs?

Accepted Answer

A) the merger of two neutron stars 
B) the merger of two white dwarf star 
C) the merger of a white dwarf star and a neutron star 
D) an explosion on the surface of a neutron star 
A) the merger of two neutron stars 
B) the merger of two white dwarf star 
C) the merger of a white dwarf star and a neutron star 
D) an explosion on the surface of a neutron star

Question 4

The charged particles that emit the beams of electromagnetic radiation from a pulsar are believed to be:

Accepted Answer

A) iron and other nuclei pulled from the neutron star's crust by its intense magnetic fields. 
B) plasma (ionized gas) spiraling onto the neutron star from a normal stellar companion. 
C) electrons and hydrogen and helium nuclei from the neutron star's ionized atmosphere. 
D) electron-positron pairs created by very strong electric fields near the neutron star's surface. 
A) iron and other nuclei pulled from the neutron star's crust by its intense magnetic fields. 
B) plasma (ionized gas) spiraling onto the neutron star from a normal stellar companion. 
C) electrons and hydrogen and helium nuclei from the neutron star's ionized atmosphere. 
D) electron-positron pairs created by very strong electric fields near the neutron star's surface.

Question 5

A gravitational wave is caused by:

Accepted Answer

A) accelerating masses. 
B) increase in mass. 
C) conversion of mass to energy. 
D) conversion of energy to mass. 
A) accelerating masses. 
B) increase in mass. 
C) conversion of mass to energy. 
D) conversion of energy to mass.

Question 6

The "no-hair theorem" states that we can determine all of the following properties of a black hole EXCEPT ONE. Which one is the exception?

Accepted Answer

A) angular momentum 
B) electric charge 
C) magnetic field 
D) mass 
A) angular momentum 
B) electric charge 
C) magnetic field 
D) mass

Question 7

What happens to the mass ejected into space when two neutron stars merge?

Accepted Answer

A) A planetary nebula is created. 
B) The mass falls back down onto the merged object. 
C) A moon is eventually formed orbiting the merged object. 
D) Large quantities of heavy elements such as gold and uranium are produced. 
A) A planetary nebula is created. 
B) The mass falls back down onto the merged object. 
C) A moon is eventually formed orbiting the merged object. 
D) Large quantities of heavy elements such as gold and uranium are produced.

Gamma-ray bursters are:

Suppose that a neutron star of 2.8 M_ε is part of a binary star system in which the other star is a normal giant star. What would happen if 0.5 M_ε of material were transferred onto the neutron star from its companion?

What event is now known to be a source of short GRBs?

The charged particles that emit the beams of electromagnetic radiation from a pulsar are believed to be:

A gravitational wave is caused by:

The "no-hair theorem" states that we can determine all of the following properties of a black hole EXCEPT ONE. Which one is the exception?

What happens to the mass ejected into space when two neutron stars merge?

Astronomy and the Universe

Knowing the Heavens

Eclipses and the Motion of the Moon

Gravitation and the Waltz of the Planets

The Nature of Light

Optics and Telescopes

Comparative Planetology I: Our Solar System

Comparative Planetology II: the Origin of Our Solar System

The Living Earth

Our Barren Moon

Mercury, Venus, and Mars: Terrestrial, yet Unique

Jupiter and Saturn: Lords of the Planets

Jupiter and Saturns Satellites of Fire and Ice

Uranus, Neptune, Pluto, and the Kuiper Belt: Remote Worlds

Asteroids, Comets, and Impacts

Our Star, the Sun

The Nature of the Stars

The Birth of Stars

Stellar Evolution: on and After the Main Sequence

Stellar Evolution: The Death of Stars

Our Galaxy

Galaxies

Quasars and Active Galaxies

Cosmology: The Origin and Evolution of the Universe

Exploring the Early Universe

The Search for Extraterrestrial Life

Filters

Exam 21: Stellar Remnants: Neutron Stars and Black Holes

Gamma-ray bursters are:

Suppose that a neutron star of 2.8 Mε is part of a binary star system in which the other star is a normal giant star. What would happen if 0.5 Mε of material were transferred onto the neutron star from its companion?

What event is now known to be a source of short GRBs?

The charged particles that emit the beams of electromagnetic radiation from a pulsar are believed to be:

A gravitational wave is caused by:

The "no-hair theorem" states that we can determine all of the following properties of a black hole EXCEPT ONE. Which one is the exception?

What happens to the mass ejected into space when two neutron stars merge?

Astronomy and the Universe

Knowing the Heavens

Eclipses and the Motion of the Moon

Gravitation and the Waltz of the Planets

The Nature of Light

Optics and Telescopes

Comparative Planetology I: Our Solar System

Comparative Planetology II: the Origin of Our Solar System

The Living Earth

Our Barren Moon

Mercury, Venus, and Mars: Terrestrial, yet Unique

Jupiter and Saturn: Lords of the Planets

Jupiter and Saturns Satellites of Fire and Ice

Uranus, Neptune, Pluto, and the Kuiper Belt: Remote Worlds

Asteroids, Comets, and Impacts

Our Star, the Sun

The Nature of the Stars

The Birth of Stars

Stellar Evolution: on and After the Main Sequence

Stellar Evolution: The Death of Stars

Our Galaxy

Galaxies

Quasars and Active Galaxies

Cosmology: The Origin and Evolution of the Universe

Exploring the Early Universe

The Search for Extraterrestrial Life

Filters

Suppose that a neutron star of 2.8 M_ε is part of a binary star system in which the other star is a normal giant star. What would happen if 0.5 M_ε of material were transferred onto the neutron star from its companion?