Chp 22

Neutron stars and black holes are formed by:

In a neutron star, the core is:

Two important properties of young neutron stars are:

Neutron stars have:

An object more massive than the Sun, but roughly the size of a city, is a:

What would happen if mass is added to a 1.4 solar mass white dwarf?

The average density of neutron stars approaches:

Pulsars:

Neutron stars do NOT have:

Which of these does NOT exist?

When observing an object, such as a space ship that is moving very quickly relative to you, the length of objects on that object will appear to be:

General relativity explains the observed precession of the orbit of:

Newly formed neutron stars have weak magnetic fields which strengthen over time, due to the conservation of angular momentum.

The density of a neutron star is comparable to the density of an atomic nucleus.

Special relativity predicts that light bends near dense objects.

Mercury's orbital precession is adequately explained by Newton's Law of Gravity.

The vast majority of pulsars are known only from their pulses in:

What compelling evidence links pulsars to neutron stars?

What makes the Crab pulsar somewhat unusual among pulsars in general?

What makes the Crab Nebula supernova remnant unusual as a supernova remnant?

In the Lighthouse Model,

In the Lighthouse model:

Which of the following is NOT a property of a pulsar?

Whose work with SETI led to the discovery of pulsars in 1967?

The supernova of 1054 AD produced:

While most neutron stars are also pulsars, an older "bare" neutron star was captured in rapid motion only 200 lightly years distant by:

In binary neutron star systems, the orbits are expected to slowly decay, eventually resulting in a merger of the neutron stars. Where does the orbital energy go?

Like most pulsars, the Crab Nebula neutron star is known only by its radio pulses.

Neutron stars seem to travel a good deal faster than most stars in orbit about the Galaxy.

All neutron stars are pulsars, but not all pulsars are neutron stars.

Three terrestrial-sized planets in orbits of a fraction of an AU have been found near:

Most pulsars have a measured mass of:

What are X-ray bursters?

To which of these phenomena are X-ray busters most similar?

Almost half of all known millisecond pulsars are found in what type of object?

X-ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are:

You would expect millisecond pulsars to be:

A critical difference between millisecond and normal pulsars is that:

All neutron stars must begin as millisecond pulsars just after their supernova creation.

X-ray bursters are similar to novae, except the collapsed star is a neutron star, not a white dwarf.

If the rate at which a pulsar is slowing down is found, this helps us find the time at which it was produced by the supernova.

A proposed explanation for gamma-ray bursters is:

What would happen if more mass was added to a 1.4 solar mass neutron star?

In contrasting the distribution of the X-ray and gamma-ray bursts, we find:

The Swift satellite observes what portion of the electromagnetic spectrum?

Redshift measurements of the visible afterglow of a gamma-ray burst show that these objects are:

Relatively long duration gamma-ray bursts are produced by:

Gamma-ray bursts seem to come primarily from neutron star binaries in the plane of our own Milky Way Galaxy.

Astronomers believe that gamma-ray bursters emit radiation equally in all directions.

Which of the following can actually escape from inside a black hole's event horizon?

The mass range for neutron stars is:

A hypernova creates:

The densely packed neutrons of a neutron star cannot balance the inward pull of gravity if the total mass is:

The Schwartzschild radius for a 12 solar mass star is:

The escape speed for a black hole's event horizon is the speed of light.

Any main sequence star over 25 solar masses will probably retain enough matter in its core after its type II supernova to make a black hole.

The Schwarzschild radius of a black hole is about 3 km per solar mass; it is amazingly linear over a wide range of masses.

What explanation does general relativity provide for gravity?

An observer on a planet sees a spaceship approaching at 0.5c. A beam of light projected by the ship would be measured by this observer to travel at:

As a spaceship's velocity gets closer to the speed of light:

The equivalence principle says that a person in an elevator that is in free fall feels the same acceleration as:

If light from a distant star passes close to a massive body, the light beam will:

Special relativity says that c, the speed of light, is the maximum velocity for both matter and energy in our universe.

Only neutrinos can go faster than the speed of light, as proved by Supernova 1987A.

What can we detect from matter that has crossed an event horizon?

As a spaceship nears an event horizon, a clock on the spaceship will be observed:

Which of the following are attracted by gravity?

The observed slowing of a clock in the vicinity of a black hole is a prediction of:

If the Sun were replaced by a one solar mass black hole:

Why do scientists describe the theory of gravity as "incomplete"?

At the event horizon, time stops.

What is Cygnus X-1?

The key to identifying a black hole candidate in a binary system is that:

A method for identifying a black hole is to:

The largest known black holes:

Which of the following is NOT an argument for Cygnus X-1's being a true black hole?