Eternity is an idea humans have wrestled with for thousands of years. We will all die, but time will tick on forever after we are gone. But what if there comes a time when there is no more after? Could time itself end? It's a question scientists are daring to answer.One bold scientist thinks time always was and always will be, but space will come crashing down in an apocalyptic end. Another scientist argues that if time never ends, our very existence stops making sense. An infinite amount of time means an infinite number of bizarre possibilities. But perhaps our universe is just one tiny patch in a much larger, eternal multiverse. Time will end for us, but the multiverse is a place that lasts forever.Perhaps time isn't what we think it is. One visionary believes time is not a normal dimension, but a holographic projection, where all eternity already exists. Everything our universe ever was and ever will be is sitting in the far future and is being projected back into the past.But what if time is ruled by the fuzzy world of quantum mechanics, where nothing is certain? One team of scientists is finding evidence that the future is affecting the present. The present and the past may be echoes of the future that are rippling back in time. The fate of the universe may already be right in front of us.