You lot, you spend all your time thinking about dying, like you’re gonna get killed by eggs, or beef, or global warming, or asteroids. But you never take time to imagine the impossible. Like maybe you survive. This is the year 5.5/apple/26, five billion years in your future, and this is the day… Hold on… This is the day the sun expands. Welcome to the end of the world.

The 9th Doctor, Season 1 Episode 2, The End of the World.