A neutron star is what remains after a massive star goes supernova. Composed entirely of neutrons, this compact star possesses a radius of only a dozen kilometers (approx. 7 miles) but has a mass ...

The basic formula for producing a neutrino in a neutron star is straightforward: A neutron decays, transforming into a slightly-lighter, low-energy proton and an ultralight neutrino.

But things appear much differently for 4U 0142+61, which astronomers theorize had a violent history, even for a neutron star. It actually is solid, or so it appears. Approximately 100,000 years ...

The supernova that gives rise to a neutron star imparts a great deal of energy to the compact object, causing it to rotate on its axis between 0.1 and 60 times per second, and up to 700 times per ...

Neutron stars are some of the densest objects in the universe. They are the core of a collapsed megastar that went supernova, ...

Stars like our sun create energy through thermonuclear reactions and, when they die, become "white dwarf" stars. A neutron star, by contrast, is created when a star much, much larger than the sun ...

Binary neutron star mergers as astrophysical treasure trove. Neutron stars are compact, extremely dense remnants of supernova explosions. They are about the size of a city with up to twice the mass of ...

Neutron stars can have a resounding impact around the universe. Scientists recently announced the first detection of gravitational waves created by two neutron stars smashing into each other. 1:33 ...

The neutron star, known as PSR J0952-0607, was discovered in 2017 about 3,000 light-years from Earth in the constellation Sextans. Recent measurements show the star weighs 2.35 times as much as ...

A binary system with a neutron star in a 27-day orbit and a more massive, rapidly-rotating donor star. An artist’s impression of the binary system Swift J0243.6 6124.

Neutron stars are like the most efficient thermoses in the universe, filled with hot noodle soup. Here's how, over the course of millions of years, they cool down.