The final evolutionary stage for larger stars, in which they have exhausted their thermonuclear fuel and radiate relic heat. Neutron stars are extremely dense and are supported by neutron degeneracy pressure.
A neutron star is the remnants of a dead supergiant. When the star collapses, the negatively charged electrons are combined with the positively charged protons, which forms neutral neutrons. Thus the name, neutron star. This small dense ball of matter, contains all the mass and magnetic field of the star's core.
Stars born with about 8 to 20 times the mass of the Sun blast most of their material into interstellar space in titanic explosions, leaving only their crushed, dense cores, called neutron stars. Neutron stars are named after their composition: neutrons. In a star with a core that is 1.4 to 3 times the mass of the Sun, the core collapses so completely that electrons and protons combine to form neutrons. A full bathtub of neutron-star material (instead of water) would weigh as much as two Mount Everests. A neutron star is about 10-15 miles (16-24 km) in diameter, with a liquid neutron core and a crust of solid iron. Some neutron stars, called pulsars, spin rapidly (from once a second to several hundred times per second) and generate powerful magnetic fields.
Gravitationally collapsed star of very small dimensions and enormously high density, composed mainly of neutrons that may be the core remnant of a supernova.
A cold star, about 20 miles in diameter. One of the ways a star can spend its old age. Exclusion principle repulsion among its neutrons balances the pull of gravity Photon - A messenger particle that carries the electromagnetic force. The photon is a particle of light and all other forms of electromagnetic radiation (gamma rays, X rays, radio waves, etc.)
An extremely dense star comprised mainly of neutrons, endpoint of the life of a massive star which has exploded as a supernova. Under huge gravitational forces electrons have been compressed into protons and produced neutrons. A typical neutron star has about 3 times the mass of the Sun but a radius of only 10 kilometres. Fast spinning neutron stars can be observed as pulsars. If the Sun were to become a neutron star it would have a diameter of only 20 km.
Neutron stars are the super dense remains of massive stars, and they are often what is left behind after a supernova explosion.
An object only tens of miles across, but greater in mass than the Sun.
The imploded core of a massive star sometimes produced by a supernova explosion. Neutron stars typically have a mass 1.4 times the mass of the Sun, and a radius of about 5 miles. Neutron stars can be observed as pulsars.
A star that has collapsed to the point where it is supported against gravity by neutron degeneracy.
The remnant core of a massive star after a supernova explosion. It is extremely dense. Though its diameter is only about 15 kilometers, its mass is about 1.4 times that of the Sun.
A dead star comprised primarily of neutron-degenerate gas. Typically, such objects have a mass similar to or slightly larger than that of the Sun, but a diameter of about 10 miles. As in the case of electron-degenerate stars, or white dwarfs, more massive neutron stars are smaller, and when they become smaller than the Schwarschild limit, cannot exist as stable objects. Depending upon the nature of the gas in the core of a neutron star (which may, to a certain extent, involve physics beyond definite current knowledge), the maximum mass of a neutron star is between 2 and 3 Solar masses. The density of such a star is several trillions of times the density of water, the gravity is several billions of times the gravity of the Earth, and the escape velocity is a substantial fraction of the speed of light. Rotating neutron stars may produce pulsars. Neutron stars which have material dumped on them by a companion may produce X-ray bursts, or even more exotic phenomena associated with rapidly spinning accretion disks, surrounding the star.
A star of extremely high density composed almost entirely of neutrons.
Cold, degenerate, compact star in which nuclear fuels have been exhausted and pressure support against gravity is provided be the pressure of neutrons.
A celestial body hypothesized to occur in a terminal stage of stellar evolution, essentially consisting of a super dense mass of neutrons and having a powerful gravitational attraction from which only neutrinos and high-energy photons can escape, thus rendering the body invisible except to x-ray detection.
A very small, dense star that is so tightly packed together that the protons and electrons have been compressed to form neutrons.
A dense ball of neutrons that remains at the core of a star after a supernova explosion has destroyed the rest of the star. Typical neutron stars are about 20 km across, and contain more mass than the Sun.
A star that has collapsed under its own gravity, with vast gravitational and magnetic forces. It is called a neutron star because with that much gravity, protons fuse with electrons to form neutrons, so the star is almost entirely composed of neutrons.
A compact star with a radius of about 10 km and a mass of about 1.5 times that of our Sun. A neutron star internally supports itself against gravity by pressure from the strong nuclear force between neutrons, which are uncharged elementary particles commonly found in the nuclei of atoms.
a collapsed star with such high gravity that its atoms are packed together to the point that there is no room for electrons to orbit their nucleii
a compact star in which the weight of the star is carried by the pressure of free neutrons
a compressed, very dense ball of matter formed when a giant star explodes after its nuclear fuel runs out
a dead star in which gravity has squeezed all of the matter into the size of a small city
a dead star that has lost most of its material in an explosion
a dying star
a gigantic nucleus, with the mass of the Sun
a kind of collapsed star that is immensely dense and is made mostly of neutrons
a less dense form of a collapsed old star, but still has a density of more than a billion tons per teaspoon of material
an extremely dense and compact star that has undergone gravitational collapse to such an extent that much of the material has been compressed into neutrons
a product of great explosion of a red star, called super nova
a small, but extraordinarily dense object that is the remnants of a star has run out of fuel and collapsed
a star made entirely out of neutrons, as the name suggests
a star that has collapsed to a very dense soup of neutrons
a star that has exhausted its nuclear energy and suffered gravitational collapse to form a region of a high density of neutrons
a stellar object which consists of a gigantic nucleus composed of neutrons only
a very small but dense star, the size of a mountain but as massive as a star like the Sun
a very small, super-dense star which is composed mostly of tightly-packed neutrons
see related section] a rapidly spinning, extremely dense star composed of mainly neutrons.
the remnant of a high-mass star. The gravity of these stars is strong enough to knock the electrons out of their orbit and into the nucleus of the atoms. There, they form with protons to form neutrons. The structure of the nucleus is strong enough to resist any further gravitational collapse
the imploded core of a massive star remaining after a supernova explosion. Contains about the mass of the Sun in less than a trillionth of the Sun's volume.
A cold star, supported by the exclusion principle repulsion between neutrons.
A compact star consisting predominantly of neutrons. Neutron stars have masses in the range of about one to three solar masses and sizes of around 12 miles. Their density is comparable to that of atomic nuclei (i.e., about 100 to 1,000 trillion times the density of water).
A giant ball of neutrons (particles found in the nuclei of atoms). Neutron stars are very dense, only ten or twenty kilometres across, but more about 1.4 to 3 × the mass of our Sun. They are formed in supernova explosions.
a small, extremely dense star composed mostly of neutrons, or the remains of a supernova explosion.
An extremely dense collapsed star consisting mainly of neutrons. A neutron star is what often remains after the supernova explosion of a massive star.
One of the possible end-points of a star. A neutron star is very dense, with the mass of about 1.4 Suns contained in a sphere with a radius of about 10 km.
A giant ball of neutrons (particles found in the nuclei of atoms). Neutron stars are very dense, only ten or twenty kilometres across, but more massive than our Sun. They are formed in supernova explosions (see below).
A type of very dense star formed after a supernova. The Earth and beyond
A type of star which is very old, having cooled off and stopped nuclear fusion reactions. When gravity pulls the star down on itself, the electrons and protons are squeezed together, leaving just neutrons. The star is then supported against gravity by "neutron degeneracy pressure" (no two neutrons can be in the same place at the same time). These are produced when a star is too heavy to be a white dwarf, but not heavy enough to turn into a Black Hole.
The collapsed core of a massive star remaining after a supernova explosion. Usually, the core will have a mass of 1.4 times that of the Sun and a diameter of about 10 miles. Because matter is compressed so tightly, negatively charged electrons and positively charged protons are forced together. The resulting star consists of a core of superfluid neutrons and superconducting protons encased by a solid crystalline crust.
A collapsed, extremely dense star (i.e., a billion tons per cubic centimeter) consisting almost entirely of neutrons; the final state of a star about twice as massive as the sun
A small, extremely dense star made primarily of neutrons, with a radius of approximately 10 kilometers.
A compact stellar object containing roughly the mass of the Sun, but compressed into an object about 10 miles across. Such objects have nearly the same mass density as a nucleus, and are composed mainly of neutrons. More.
Star made of degenerate neutrons, covered by a thin crust of heavy elements -- remnant of massive star after Type II or Ib SN. Neutron stars have masses between 1.4 and about 3 times that of the Sun.
When a star runs out of fuel it collapses, because it can no longer support its own weight. If the star has a lower mass than 1.4 solar masses, the Chandresekhar limit, it will become a white dwarf. If the mass is greater than this then the pressure is too great for a white dwarf to support itself. Then a supernova explosion will occur, blowing away some of the mass of the star. If the star is still sufficiently massive it will overcome electron degeneracy pressure. Protons are forced to become neutrons, by absorbing electrons and emitting neutrinos. The neutron degeneracy pressure is then all that supports the star. The neutron star is born. The neutron star has an incredible density of about 1014 grams per cubic centimetre. Pulsars are spinning neutron stars. If the mass is too great for the neutron degeneracy pressure to support it then a black hole will be formed.
The remnant of a supernova, a neutron star is supported by degenerate neutrons and has a mass near the Chandrasekhar limit. Neutron stars spin rapidly and, if aligned just so, are visible as pulsating radio sources or pulsars.
The imploded core of a massive star produced by a supernova explosion. Neutron stars typically have 1.4 times the mass of the Sun contained in radius of about 5 miles. According to astronomer and author Frank Shu, “a sugar cube of neutron-star stuff on Earth would weigh as much as all of humanity!” Neutron stars can be observed from Earth as pulsars.
A star (approximately sun-sized or larger), a remnant of a supernova explosion, in which gravity has caused all matter to collapse to a giant nucleus, composed only of neutrons. The collapse is also expected to greatly amplify any magnetic field present in the pre-collapse star, as well as speed up enormously any rate of rotation. It is believed that pulsars, pulsating radio sources with very precise pulsation periods, are neutron stars of radius about 10 km and rotation period about 1 second. Their magnetic axis spins and beams radio waves, in a way similar to the way a lighthouse beams its light. We detect pulsars when the Earth is in one of the directions swept by the beams.
The core of a supergiant star which has collapsed during a supernova explosion so much that it consists entirely of neutrons. Most stars between 8 and 60 solar masses end their lives like this usually producing a neutron star with a mass of about 1.4 solar masses. Neutron stars are only 10 kilometres across and have an incredible density - a teaspoon of neutron star material would have a mass of hundreds of millions of tonnes. See also Black hole.
A dense ball of neutrons that remains after a supernova has destroyed the rest of the star. Typically neutron stars are about 20km across, and contain more mass than the Sun. [More Info: Field Guide
A very dense stellar remnant, formed when a star with a remnant bigger than about 1.4 solar masses explodes in a supernova. They spin rapidly.
The imploded core of a massive star produced by a supernova explosion. (typical mass of 1.4 times the mass of the sun, radius of about 5 miles, density of a neutron.) According to astronomer and author Frank Shu, "A sugarcube of neutron-star stuff on Earth would weigh as much as all of humanity! This illustrates again how much of humanity is empty space." Neutron stars can be observed as pulsars.
The imploded core of a star between 1.4 and 3 times the mass of a sun produced by a supernova explosion.
A compressed core of an exploded star made up almost entirely of neutrons. Neutron stars have a strong gravitational field and some emit pulses of energy along their axis. These are known as pulsars.
the collapsed, extraordinarily dense, city-sized remnant of a high-mass star.
An object composed entirely of neutrons (neutral elementary particles). The object is little more than 10 miles across but has a mass somewhat larger than the Sun. It is produced when an intermediate-mass star dies in a supernova explosion. How can a star become a black hole
An astrophysical object that arises at the end of the lifetime of certain massive stars. A typical neutron star has the mass of several Suns crammed into a ball with a diameter about that of a city.
Neutron stars are also the cores of the stars which have exploded as supernovae. This only happens when the core is between one and a half to three solar masses. They are normally 10 kilometers in diameter and consist mainly of sub-atomic particles called neutrons. These stars are so dense that a teaspoonful would weigh about a billion tonnes. Neutron stars are also observed as pulsars, they are so called because they rotate rapidly and emit two beams of radio waves, which are detected as short pulses.
extremely compact and dense star, formed during the final evolution of a massive star. The matter in a Neutron Star is not in the ordinary physical state that we all know: the pressure of the concentrated matter is so high that the atoms "break", and protons and electrons merge forming a sea filled with neutrons.
A collapsed star of extremely high density. Generally these objects have slightly more mass than the Sun, but are only about 10 km in radius. A neutron star has intense gravity, and may also have an intense magnetic field and fast rotational component.
the collapsed core for an intermediate to high-mass star. The core is more than 1.4 solar masses but less than 3 solar masses and is about the diameter of a city. The pressure from degenerate neutrons prevents further collapse.
An extremely compact ball of neutrons formed from the central core of a collapsed star and having the mass of a star but a size smaller than the Earth's Moon.
An extremely compact ball of neutrons created from the central core of a star that collapsed under gravity during a supernova explosion. Neutron stars are extremely dense: they are only 10 kilometers or so in size, but have the mass of an average star (usually about 1.5 times more massive than our Sun). A neutron star that regularly emits pulses of radiation is known as a pulsar.
A small, highly dense star composed almost entirely of tightly packed neutrons. Radius about 10 kilometers.
Any of a class of extremely dense, compact stars thought to be composed primarily of neutrons; see pulsar
"Neutron Star," is a science fiction short story written by Larry Niven. It was originally published in the October 1966 issue of Worlds of If. It was later reprinted in Neutron Star, (New York: Ballantine, 1968, pp. 9-28, ISBN 0-345-29665-6), and Crashlander (New York: Ballantine, 1994, pp. 8-28, ISBN 0-345-38168-8).