You’re thinking about the expansion of the sun and whether humans will survive it. You’re thinking about language, how Martian dialects will be different to the ones on Earth. You’re thinking that one day a human living on Earth won’t understand a human living in space. You’re thinking that you’ll probably see that happen. You’re thinking that you should do your laundry tomorrow. You’re thinking about how there’s two different kinds of immortality, and you’re really hoping you have the kind where you don’t age and not the one where you can never die. You’re thinking about the heat death of the universe, and how that will feel. You’re thinking about your mother, who died fifty years ago and whose death still feels like a knife in your ribs. You’re thinking about death, and how many you’ll see. You’re thinking about death, and whether you’ll get one. You’re thinking about how you’d really like to get some sleep now.