Some Scientists think that a Supernova is to blame for dinosaur Extinction. Although, there is not even an inch of evidence to this theory they simple say its very possible. A Supernova is a Star that explodes and sends a shockwave of the amount of energy of radiation that the Sun creates at an estimate of about 20 billion years. So, in simple words a supernova destroys everything in its path and anything far enough out of the path to not get the explosion may get stomped by mass radiation. This won't destroy the earth but it will kill just about every living thing that isn't buried hiding in a hole for years. The supernova isn't just a exciting fictional belief either. It happens every 50 years or so in the milky way.