Neutron Stars are some of the weirdest objects in space. They are made of the collapsed core of a star. They form after a massive star goes supernova, and a gravitational collapse. The gravitational collapse will compress the star so much, it goes past the density of a white dwarf, and to that of Atomic Nuclei. An Atomic Nucleus is the small dense region at the center of an atom consisting of Protons and Neutrons. To put it in perspective , just think of a black hole, except white and with no event horizon. Neutron stars are usually very small, about at small as a small country or a state in the U.S. These stars are composed of entirely neutrons. No electrons of protons. Neutron stars are often extremely hot, reaching temperatures up to 1 million K (Kelvin). Their magnetic fields are extremely strong, up to 8 trillion times more than Earth. These stars often spin extremely fast, often hundreds of times a second. If you dropped something over a Neutron star, it would instantly be crushed under its extreme gravity, as it's sent flying towards the center of it.