To understand neutron stars, we must understand super massive star's death.
A supermassive star ends its life in a dramatic way. When it runs out of fuel, its core can no longer support the crushing weight of its outer layers. The core collapses in an instant, triggering a powerful explosion called a supernova that blasts material into space. If the star was extremely massive, the collapse continues until it forms a black hole, an object with gravity so strong that not even light can escape, OR, there is also another option, which is a
Neutron Star.
A neutron star is a dead remain of the star from it originated. It's core (the innermost layer) is so tightly packed that even proton (light) and electrons are merged together!
It's so heavy that a teaspoon of it would weigh more than the the
MOUNT EVEREST.
Neutron star can have a radius of about 10km and a mass of 1.4 Solar masses! Wow thats massive!
It is suspected that there are about 1 billion neutron stars just in
our galaxy, the Milky Way.
However, many of them have existed for a long period of time and have cooled down considerably. These stars radiate very little electromagnetic radiation; most neutron stars that have been detected occur only in certain situations in which they do radiate, such as if they are a pulsar or a part of a binary system. Slow-rotating and non-accreting neutron stars are difficult to detect, due to the absence of electromagnetic radiation; however, since the Hubble Space Telescope's detection of RX J1856.5−3754 in the 1990s, a few nearby neutron stars that appear to emit only thermal radiation have been detected.
Hence, we can say that the Universe can push things to its absoloute limits! In short we can say that neutron stars is a very dense, dead core of a star which spins very fast, here's a fact! Because you know, who doesn't like facts?
A teaspoon of a neutron star would weigh more than the Mount Everest!
*Some of the parts of the website is inspired by NASA's official website*
Designing ideas credit goes to NASA (Respect!)