NASA has released an ultra-high-definition 4K video of the Aurora Borealis and Aurora Australis, taken from the International Space Station. It makes for spectacular viewing. Watch it in full-screen mode for best results.
I don't suppose I'll live long enough to get into space. It's the only thing that makes me wish I was younger. The odds are pretty good that someone in his or her twenties today will be able to take a tourist flight to orbit before they die, and see such sights for themselves.