Looks cool... as an astrophysicist I cringe when I hear "a billion" years. I don't know if he understands how long or not long that is considering what he's said about it. 8 great ages have past on earth... Now it took around 5 billion years for life to advance on earth as it has. Humans go to where we are in what... ~12,000 years? Around 65 million years is when the dinosaurs had their heyday. Now im no anthropologist but A billion years is... I ... ugh.. I Dont even know it just seems like he picked a large number and said Eh...... there's also several other things to think about, considering the moon is going to be much farther away from us then ( if it isnt gone altogether from some rogue comet or something), Saturn wont have rings, the sun wont quite be red giant yet, but it will be past mid age... I can't imagine the earth being anything other than a desolate wasteland ( of course you can say SCIENCE-MAGIC and take care of that) . I dont know, im definitely curious just to see how much thought was put into it.