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Neutron Stars

A neutron star is the remains of a massive star that exploded. It is one of the densest objects known in the universe.

196 Questions

Is the density of a pulsar greater than the density of a neutron star?

No. A black hole is in some ways just a very compact neutron star; if a normal neutron star was able to implode that far, it would have done so and become a black hole already.

There is a simple law of physics called the Pauli Exclusion Principle which states that no two neutrons can occupy the same quantum state simultaneously this prevents further collapse of neutron stars.

What is a rapidly spinning neutron star called?

A young neutron star. Really - that is what a neutron star is.

If the neutron star's magnetic field is pointed towards Earth, then it is referred to as a pulsar - because of it's rapid pulsations [See related question] but it is still a neutron star.

A spinning neutron star has been observed at the center of a?

neutron star has been observed at the center of a supernova remnant, known as the Crab Nebula. This neutron star, also called a pulsar, spins rapidly, emitting beams of radiation that are observed as pulses by astronomers.

What is the smallest star to the biggest star of these 1. neutron stars 2. white dwarfs 3. dwarf stars 4.giants 5. supergiants?

  1. Neutron stars are typically around 10-20 km in diameter.
  2. White dwarfs are usually about the size of Earth, around 6,000-12,000 km in diameter.
  3. Dwarf stars are generally similar in size to our Sun, around 1 million km in diameter.
  4. Giants can vary in size but are typically larger than dwarf stars.
  5. Supergiants are the largest stars with diameters that can be hundreds to thousands of times larger than our Sun.

If a magnetic field is caused by a charge in motion and if neutrons have no charge where does the magnetic field come from in a neutron star?

The reasons behind the magnetic field of a neutron star are not clear. Neutron stars are the collapsed core of star of 10 to 30 solar masses. One theory is that the magnetic field of a neutron star is because of the conservation of magnetic flux. If a star had a magnetic flux over its surface and the star then collapsed to a much smaller neutron star but the flux was conserved, then the same flux for the neutron star would be spread over a much smaller area making the magnetic field much stronger. But this explanation goes only partway towards explaining the neutron stars' magnetic field.

Two important properties of young neutron stars are?

  1. Rapid rotation: Neutron stars can spin incredibly fast, with some completing hundreds of rotations per second.
  2. Strong magnetic fields: Neutron stars have extremely powerful magnetic fields, magnitudes stronger than any other object in the universe, which can influence their behavior and emit radiation.

What type of stars make black holes and neutron stars?

Generally, the bigger the star, the bigger the result after it's death. It is important to know all of the stages after a star's death. The size of a star, I think, is called solar mass. When a star does not have a sufficient amount of fuel to keep it's temperature at a certain point, to suppress it's own gravity, it's gravity will begin to collapse in on itself, commonly known as gravitational collapse. This is where the star is going to collapse in on itself, getting rid of it's gases, but leaves a small, burning core. Only with black holes does the star completely collapse in on itself, I think. A small star, let us take our own star for example, will collapse in on itself and become a small, white dwarf. White dwarfs are small stars that burn for billions of years. I think you get a white dwarf from the death of a star that was only about 1 solar mass. You then get bigger stars which can eventually become neutron stars. This is where a bigger star only leaves neutrons basically in the core, thus making it a neutron star. Finally you get black holes. Black holes are formed by a star of about 30-40 solar masses or more. In other words, a HUGE star. The sheer size of the star means it sheds it's envelope, (outer layer basically) extremely quickly, but because the mass is so high the opposing force is not nearly as strong to counter-balance the collapse, as opposed to a white dwarf, or neutron star formation. The collapse continues and continues until it digs a hole in through itself, and with the density so high it reaches a singularity point. This is a black hole. There you have it, three rough descriptions of the stages after a star's death. I know they sound confusing, they're probably not even accurate but my knowledge on star's is pretty rusty anyway. I hope this has helped in some way.

If neutron stars are hot why arent they very luminous?

Neutron stars are hot because they are formed from the remnants of massive stars that have exploded. However, they are not very luminous because their small size leads to a low surface area for energy emission. Additionally, their intense gravitational pull can trap a significant portion of the emitted energy.

Why does a neutron star have so much gravity?

Gravity depends on two things: the mass of the object you are dealing with. A more massive object has stronger gravity, and the close you get to the center without having any of the mass above you, the stronger the gravity gets.

To start off, a neutron star has a very large mass, as much as 3 times the mass of the sun, compacted into a very small area, about the size of a city. Since it is in such a small area objects can get very close to the center of mass.

Why is a neutron star expected to spin rapidly?

All young neutron stars spin rapidly.

You might be confused with a pulsar.

See related questions.

What is bigger a black hole or a neutron star?

It all relates to what you define as big.

A black hole is an infinite region in space with an infinite density. It's "event horizon" is not infinite.

If you wish to categorise between size of a neutron star and a black hole's "event horizon", then a black hole is, in most cases larger - but there are micro black holes, which exhibit all the characteristics of a black hole but have a much smaller "event horizon".

In the physical sense, everything is bigger than a black hole, but in a terminological sense (the event horizon) it would depend on the mass of the black hole.

How long does a neutron star last after a supernova?

Nobody knows for sure, but billions of years. It would also depend on when the neutron star, no longer becomes a star. Is it when it stops radiating heat, or x-rays? The star or the remains will continue to be a physical property but will no longer radiate any energy.

What causes the collapse of a star?

The collapse of a star is based on its age. When it runs out of "Fuel" its inside contracts as the outside expands. it can then super nova or collapse into a tiny star.

Why are neutron stars so dense?

The black hole is infinitely more dense than a neutron star. The neutron star is something like the mass of upto 2.3 suns compressed into a ball a dozen or so kilometers in diameter. That makes the neutron star about as dense as the nucleus of an atom. Really dense stuff. Like a couple of million pounds per cubic inch, maybe. The density of the neutron star varies from "less" near the surface to many times "more" near the center. But the black hole has infinite density. That makes it infinitely more dense than a neutron star. A teaspoon of neuton star has more mass than the entire human population

Which has a linear size or radius closest to the radius of a neutron star?

Br is the atom with the smallest. K+ is the ion with the smallest radius. In general, the shape with the smallest radius has the smallest diameter

Are all pulsars neutron stars?

All young neutron stars in reality are "pulsars".

However, for a neutron star to be termed a pulsar, it's magnetic axis has to point towards Earth. (So we can see the pulse, even though all young neutron stars have a pulse, they cannot be observed from Earth.)

What do neutron and black stars have in common?

Everything, they are one and the same.

See related question for an explanation.

Is a pulsar denser than a neutron star?

The very definition of a black hole is a stellar body dense enough to have an escape velocity greater than that of light -- in other words, light that comes close enough to its event horizon will be trapped around it forever. If a star dies and it has enough mass to be compressed to a high-enough mass-to-radius-squared ratio to have such a high escape velocity, then a black hole will result. Otherwise, it will become a neutron star -- extremely dense, to be sure, but not dense enough to trap light, and therefore not as dense as a black hole.

What is the mass of a neutron star?

Neutron stars range in mass from 1.35 Solar masses (2.69e+30 kg) to 2.40 Solar masses (4.16e+30 kg).

Any smaller, and electrorepulsive forces will not allow the object to attain this stage (it would be a white dwarf instead), and any heavier, and the neutron star will collapse further into a black hole. This is called Schandraskar's limit a star must be at least 3 solar masses to be a candidate for a black hole however according to the Tolman, Oppenheimer, Volkov limits and star over 5 solar masses must become a black hole

What is the difference between star that become white dwarfs and stars that become neutron stars?

the simple reson is mass.......that is if the star under consideration is a heavy one, it is more likely to turn into a black hole and if it is comparatively smaller it is prone to turn into a neutron star or a white dwarf

What neutron star emit pulses of radiation called?

Pulsars and neutron stars emit a beam of electromagnetic radiation.

What makes a supernova a black hole or neutron star?

When a supernova becomes massive enough, it's own gravitational pull will pull it together, and it becomes a neutron star. A neutron is when the electrons in the atoms get pushed against the nucleus because the gravitational pull is so strong. A neutron star becomes a black hole when the individual particles (the electrons, neutrons, and protons) collapse into themselves.