Neutron stars are so dense that if you dropped a gummy bear from one meter away it would hit the surface in a microsecond with the force of 1,000 nuclear bombs.
The neutron is a subatomic particle, symbol n or n0, with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons, each with mass approximately one atomic mass unit, constitute the nucleus of an atom, and they are collectively referred to as nucleons.