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What type of stars is the double star?
Any two types of star can be gravitationally bound with another for instance you can get neutron-neutron pairs you can get two yellow stars or you can get a red super giant with a normal star so long as they are in gravitational equilibrium any two can be a paired star
What happens when a neutron star runs out of fuel?
Neutron stars do not have fuel. A neutron star is a remnant of a star that has already died.
Is the main difference between a pulsar and a binary system that a pulsar is made up of two neutron stars and that a binary system is made of of two normal stars?
Not exactly, while a pulsar is a specific type of neutron star (that being a "spinning neutron star") and a binary system is a pair of stars orbiting each other, a pulsar does not need to be part of a binary system. It would be possible, however to have a binary system with one of the pair being a pulsar and the other a neutron star (assumed to be the non-spinning or "normal neutron star" variety).
Which star is larger neutron star or subgiant star?
A subgiant star is larger than a neutron star. Neutron stars are incredibly dense and compact remnants of massive stars, while subgiant stars are in a transitional phase between main sequence and red giant stages, typically larger and more diffuse than neutron stars.
How heavy is a pin head size neutron star?
It would not exist. A neutron star is what it is by virtue of the mass of the whole star. Extracting just a pinhead would revert that matter back to normal matter. For the sake of density - as weight has nothing to do with matter outside of a gravitational body. The denisty of a pinhead of neutron star would be the equivalant of about 100 times the mass of the Great Pyramid of Giza
Are pulsars a kind of neutron star?
Pulsars are not only a kind of neutron star, they are neutron stars. See related question.
What is the difference between stars that become dwarf stars and stars that become neutron stars?
A star that becomes a white dwarf simply does not have the mass to become a neutron star. White dwarfs are the the remnants of a star very similar to our own sun in mass, where it takes a much more massive star to create a neutron star, Like the star Betelgeuse is a prime example of a star that does not have the mass to become a black hole but is massive enough to become a neutron star.
Do black holes and neutron stars have any connection?
Yes, both black holes and neutron stars are remnants of the death of massive stars. Neutron stars form when the core of a massive star collapses but does not produce a black hole. Black holes are formed when the core of a massive star collapses beyond the neutron star stage.
What is spinning neutron star called?
It is still called a neutron star. Depending on how we observe it, it may also be called a pulsar.
How many moons are around a neutron star?
There are no moons around a neutron star. A large, spherical body orbiting a neutron star would be considered a planet.
Why do neutron stars rotate so much more rapidly than ordinary stars?
Neutron stars rotate rapidly due to their conservation of angular momentum. When a massive star collapses into a neutron star, its core spins faster as it contracts. Since angular momentum is conserved, the neutron star continues to rotate rapidly as a remnant of the collapsed star.
Why does theory predict that a neutron star should spin fast?
Neutron stars are born from massive stars collapsing, which conserves the original star's angular momentum. Since the original star had a slow rotation, the neutron star that forms from it will have a faster spin due to the conservation of angular momentum.
