TED-ED: The death of the universe - Ren_e Hlozek

The shape, contents and future of the universe are all intricately related. We know that it's mostly flat; we know that it's made up of baryonic matter (like stars and planets), but mostly dark matter and dark energy; and we know that it's expanding constantly, so that all stars will eventually burn out into a cold nothingness. Ren_e Hlozek expands on the beauty of this dark ending.