And while I'm here, check this out. I love it. I've been seeing photos around the traps of earth and her lights, eg Berlin below and how east and west still show a differentiation because they tend to use different light globes:
These pics are all credited to a Cmdr Hadfield. And now here's a clip of him - yes, he's an astronaut - doing an experiment for some school kids up in space. It's great and made me think that if I'd been a kid seeing this, it would have been one of the most fantastic things in my life. Maybe it still is.