Supernova
Supernova ->> AFTER THE SUPERNOVA All supernova explosions produce clouds of debris and release huge amounts of energy, but Type I supernovas typically completely destroy their parent stars, while Type II explosions usually leave the stellar core behind. The stellar atmosphere of both types expands into space and appears as luminous clouds years, or even centuries, later. These clouds are called supernova remnants. The Crab Nebula is one of the most spectacular supernova remnants. The fate of the stellar core left behind by a Type II supernova depends on the mass of the original star. Normal atoms are made up of positively charged particles called protons, particles with no electric charge called neutrons, and much smaller, negatively charged particles called electrons. If the original star had a mass about ten times that of the Sun, the core collapses with such force that its protons and electrons combine to form neutrons. The resulting body is composed entirely of neutrons, so...