Question 1

How can an old pulsar have a very short pulsar period,say less than 0.03 seconds?

Accepted Answer

The answer of How can an old pulsar have a...

Question 2

Although neutron stars are very hot,they are faint and not easy to see at visual wavelengths.Why is this?

Accepted Answer

A) Light does not escape from their event horizon. 
B) Most neutron stars lie beyond dense dust clouds. 
C) They have only a small surface area from which to emit light. 
D) The peak of their thermal emission is at infrared wavelengths. 
A) Light does not escape from their event horizon. 
B) Most neutron stars lie beyond dense dust clouds. 
C) They have only a small surface area from which to emit light. 
D) The peak of their thermal emission is at infrared wavelengths.

Question 3

If main-sequence stars are supported by gas pressure,what supports a neutron star?

Accepted Answer

A neutron star, which is the collapsed c

Question 4

-Refer to the H-R diagram.What type of star do the two data points above spectral type "A" represent?

Accepted Answer

A) massive main-sequence stars 
B) massive supergiant stars 
C) white dwarfs with mass less than the sun's mass 
D) white dwarfs with mass greater than twice the sun's mass 
A) massive main-sequence stars 
B) massive supergiant stars 
C) white dwarfs with mass less than the sun's mass 
D) white dwarfs with mass greater than twice the sun's mass

Question 5

Why can't massive stars generate energy through iron fusion?

Accepted Answer

A) because iron fusion requires very high density 
B) because no star can get hot enough for iron fusion 
C) because both fusion and fission of iron nuclei absorb energy 
D) because massive stars go supernova before they create an iron core 
A) because iron fusion requires very high density 
B) because no star can get hot enough for iron fusion 
C) because both fusion and fission of iron nuclei absorb energy 
D) because massive stars go supernova before they create an iron core

How can an old pulsar have a very short pulsar period,say less than 0.03 seconds?

Although neutron stars are very hot,they are faint and not easy to see at visual wavelengths.Why is this?

If main-sequence stars are supported by gas pressure,what supports a neutron star?

-Refer to the H-R diagram.What type of star do the two data points above spectral type "A" represent?

Why can't massive stars generate energy through iron fusion?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

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Exam 8: The Deaths of Stars

How can an old pulsar have a very short pulsar period,say less than 0.03 seconds?

Although neutron stars are very hot,they are faint and not easy to see at visual wavelengths.Why is this?

If main-sequence stars are supported by gas pressure,what supports a neutron star?

-Refer to the H-R diagram.What type of star do the two data points above spectral type "A" represent?

Why can't massive stars generate energy through iron fusion?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters