A neutron star is a star whose core is made up mostly of neutrons. They are what's left of stars that were four to eight times more massive than the sun. These stars originate from catastrophic explosions called supernov... More »

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Neutrons were first discovered in 1932 by James Chadwick. Chadwick conducted research with Ernest Rutherford who discovered the proton. More »

A single neutron has a mass of 1.008665 atomic mass units. An atomic mass unit is a very small unit of mass equal to one-twelfth of the mass of a carbon-12 atom. Neutrons have a slightly larger mass than protons, which h... More »

The outer layers of the star undergo a supernova explosion, leaving behind a collapsed star called a neutron star. Stars of 1.4 to three times the mass of the sun give birth to neutron stars. In neutron stars, atoms are ... More »

Depending on the star's size, a supernova explosion can leave behind a neutron star, also known as a pulsar, or a black hole. A pulsar is an extremely dense ball of neutrons 10 to 20 miles in diameter that can rotate ove... More »

A dying star is a called a "red giant." This is a star whose diameter is many times greater than that of the sun (despite the fact that it is cooler). The brightness of a red giant comes from its shell, which is still bu... More »

An average star is a star predicted or observed to go through the main sequence life cycle: nebula to main sequence star to red giant to white dwarf to black dwarf. Stars with more mass explode into a supernova and colla... More »