Neutron Stars & Black Holes

Some examples of which type of dying star exhibit rapid pulses that were originally suspected to be communications from extraterrestrials?

• white dwarf.

• black hole.

• neutron star.

What kind of stellar remnant involves a rapidly spinning ball of neutrons?

• neutron star.

• black hole.

• white dwarf.

The average density of neutron stars approaches

• a million times that of normal matter.

• a million times that of even a white dwarf.

• about 10^17 kg/m3, similar to the density of atomic nuclei.

• about 10^18 times that of water.

• infinity.

Pulsars usually show ALL of the following except

• extremely rapid rotation.

• high temperature fusion reactions.

• a narrow regular pulse of radiation.

• high speed motion through the Galaxy.

• an intense magnetic field.

The lighthouse model explains how

• pulsars can be used as interstellar navigation beacons.

• the period of pulsation increases as a neutron star collapses.

• pulsars have their rotation axis pointing toward Earth.

• a rotating neutron star generates an observable beam of light.

Many millisecond pulsars lie within

• emission nebulae.

• giant molecular clouds.

• globular clusters.

• planetary nebulae.

• open clusters.

One possible explanation for a gamma-ray burst is

• matter spiraling into a large black hole.

• the collision of neutron stars in a binary system.

• variations in the magnetic fields of a pulsar.

• repeated nova explosions.

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

• gamma-ray bursts are far closer to us, so they appear more luminous.

• gamma-ray bursts are far beyond our Galaxy, at cosmological distances, and spread all over the sky, not in the plane of our Galaxy.

• gamma-ray bursts are more closely associated with open than globular clusters.

• gamma-ray bursts can repeat, while the X-ray bursts do not.

• gamma-ray bursts can be observed from the ground, but X-rays are blocked by the ionosphere for ground-based observers.

Tags

NGSS.HS-PS4-3

What kind of remnant disappears from the observable universe?

• white dwarf.

• neutron star.

• black hole.

What is the final fate of the most massive stars?

• white dwarf.

• neutron star.

• black hole.