See that green glow? It's not the aurora borealis. Although it's technically present in almost all views of the Earth from space, it can only be clearly seen at certain angles and certain times. It's a phenomenon known as airglow, and it's our own atmosphere lighting up like glow-in-the-dark paint.
As we've seen, space agencies are worth it for the art alone. In some of these pictures, in which the Earth is outlined against a backdrop of space, you can see a green band. This is not light traveling through the atmosphere - it's light being generated by the atmosphere.