The Power of a Supernova

It depends on which side of the Earth you're in, maybe. Hopefully it's like nighttime or you're sleeping when it happens. That's only if the supernova is brief enough to only last during somebody else's night. In that explosion, the supernova gives off so much energy that it can outshine the entire galaxy that it's in. And a supernova is essentially the end point of really massive stars. They have accumulated all this really heavy metal in their core and gravity gets so powerful inside these stars.