At the outset of our fall color shoot, Matt was determined to shoot the Milky Way at Mono Lake. He didn't need to twist my arm. The sky conditions were almost ideal, but we were having a little feud with another photographer about his light polluting headlamps. We had to wander about a bit, to find darkened locations. That's ok though, we statyed quite late and the other guy split.
There has been some dialog about the green light emanating from the horizon and its been determined to be a phenomenon called airglow. From orbit, I understand its visible as a green bubble enclosing the planet.
I'm just starting to experiment with shooting the night sky, getting to know my camera's higher iso performance capabilities. I wanted an exposure at something closer to 15 or 20 seconds, but I wasn't quite ready to take a chance on shooting at an even higher iso.