Your world may end with a bang... the world will end with a whimper as it is slowly heated by an expanding sun till the oceans boil away and life can no longer be supported. When the sun later contracts to be a white dwarf, the world will be a cold dead rock orbiting it until someday both are pulled into the supermassive black hole at the center of the galaxy. How's that for depressing.
Unless, of course, there's hot rebound sex involved.