Supernova

Supernovas (also know as //supernovae//) Definition - the explosion of a star, possibly caused by gravitational collapse, during which the star's luminosity increases by as much as 20 magnitudes and most of the star's mass is blown away at very high velocity, sometimes leaving behind an extremely dense core. what are they? -After hundreds of millions of years, the star reach to its point when it is going to "die". Then the star creates a massive explosion that eventually turn into a supernova. This colourful creation maybe beautiful but they are extremely translucent and the radiation it creates can usually outshine a whole galaxy! though supernova does not emit radiation for a long time. It eventually fades from view after several weeks or mabe months. But during this short period of time, Supernovas can pretty much emit as much as a sun could ever in its lifetime! although, this explosions expels all or most of the star's material at a speed of up to a tenth the speed of light, drving a shock wave into the sorrounding interstellar medium.  Several kinds of supernova exist that may be set off in one of two ways. Either just turning off or shuts down or the prodution of energy through nuclear fusion.  Here is a video where it shows an animation of a crab supernova

 media type="youtube" key="0J8srN24pSQ" height="344" width="425"  