Supernova*
Definition: a stellar explosion that creates an extremely luminous object. A supernova causes a burst of radiation that may briefly outshine its entire host galaxy before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun could emit over its life span.
Funny how one word can sum up the past few months of your life...
*Definition provided by the good folks at Wikipedia. What? Ok, raise your hand if you've got a dictionary in your back pocket.*