Question 1

Match between columns
                        Premises: Described the method of mass transfer in binary systems
Determined the density of matter needed to create a black hole
Formulated advanced theories of black holes
Determined the maximum mass of a white dwarf star
Postulated that nothing can move faster than light

Accepted Answer

The Answer of Roche and Chandrasekhar and Einstein and Schwarzschild is...

Question 2

A hypernova is a violent event caused by _____.

Accepted Answer

A hypernova is caused by the collapse of a rapidly rotating massive star. This collapse results in a supernova explosion that is more energetic than a typical supernova.

Question 3

What are the physical properties neutron stars, and how does theory predict these properties?

Accepted Answer

The answer of What are the physical properties neutron stars,...

Question 4

The orbits of binary pulsars will get smaller because of _______________ radiation.

Accepted Answer

The answer of The orbits of binary pulsars will get...

Question 5

What evidence did astronomers use to prove jets travel in opposite directions?

Accepted Answer

Spectral lines from fast-moving red- and blue-shifted ionized gas can indicate the presence of jets traveling in opposite directions. If the gas is moving away from us, the spectral lines will be shifted toward the red end of the spectrum, and if it is moving toward us, the lines will be shifted toward the blue end of the spectrum. By analyzing the spectra of ionized gas in the vicinity of a jet, astronomers can determine if the gas is moving in opposite directions, indicating the presence of a bipolar jet.

Question 6

A supermassive, rapidly rotating star may generate a gamma-ray burst in a(n) _______________ eruption.

Accepted Answer

The answer of A supermassive, rapidly rotating star may generate...

Question 7

Any compact object with a mass greater than _______________ solar masses must form a black hole.

Accepted Answer

The answer of Any compact object with a mass greater...

Question 8

Extremely old pulsars that have experienced large amounts of mass transfer may become _______________ pulsars.

Accepted Answer

The answer of Extremely old pulsars that have experienced large...

Question 9

Gamma ray bursts were first recorded while trying to detect _____.

Accepted Answer

Gamma ray bursts were first detected by satellites designed to monitor compliance with the 1963 Partial Test Ban Treaty, which banned nuclear tests in the atmosphere, in outer space, and underwater. The satellites detected bursts of gamma radiation that were initially thought to be potential violations of the treaty, before their true nature was understood.

Question 10

A compact object emitting very regularly spaced bursts of radio energy is known as a(n) _______________.

Accepted Answer

The answer of A compact object emitting very regularly spaced...

Question 11

Gamma ray bursts are ____.

Accepted Answer

Gamma ray bursts are extremely powerful and have the potential to cause mass extinction events on Earth.

Question 12

A star with a mass of 10 to 20 solar masses will produce a(n) _______________ remnant after a supernova explosion.

Accepted Answer

The answer of A star with a mass of 10...

Question 13

A magnetar is a type of ____.

Accepted Answer

A magnetar is a type of neutron star with an extremely strong magnetic field.

Question 14

Schwarzschild showed how the _______________ of the event horizon depends only on the mass of the black hole.

Accepted Answer

The answer of Schwarzschild showed how the _______________ of the...

Question 15

Gamma ray bursts _____.

Accepted Answer

The answer of Gamma ray bursts _____.
...

Question 16

Why are black holes called "black"?

Accepted Answer

The answer of Why are black holes called "black"?...

Question 17

Jets from compact objects are explained by the effect of _____.

Accepted Answer

Jets from compact objects are usually attributed to the effect of magnetic fields, which can focus and accelerate charged particles to high velocities.

Question 18

The _______________ model explains pulsars using beams of radiation that sweep around the sky.

Accepted Answer

The answer of The _______________ model explains pulsars using beams...

Question 19

The mass of a black hole concentrated in an infinitesimally small volume with zero radius, is known as a(n) _______________.

Accepted Answer

The answer of The mass of a black hole concentrated...

Question 20

What prediction does general relativity make for pulsars in a binary system?

Accepted Answer

The answer of What prediction does general relativity make for...

Quiz 14: Neutron Stars and Black Holes

Match the scientist with the appropriate contribution to the theory of compact objects.