Imagine still being alive to witness the slow, agonizing death of the universe, when all matter and energy are evenly spread across an incomprehensible vastness, and nothing will or can ever happen again. The next billion years would be fairly interesting until the sun expands and swallows the Earth…or, at least, dries up its oceans. Hopefully, you’ve found a way out and onto another planet for another billion or so years. But after about 170 quattuorvigintillion years of cold, dark, nothingness, you’ll probably get pretty bored of it all.