On my second trip to La Silla, I had plenty of free time. We were observing for three nights, but the transport from La Serena to La Silla only goes three times a week, so we had to arrive three nights before our run started, and leave one night after. So, we did a lot of photography. I made this image by stacking 700 individual images, each of which was a 20s exposure at ISO 100, using a 24mm lens at f/1.4. I started the sequence about 45 minutes after sunset, so that there was still some twilight to light up the sky. The moon was full, so the telescopes and the desert got illuminated by that.
The night after our observations, we spent one more night at La Silla before our transport back to La Serena. We were out taking photographs when the airglow became very strong, just about visible to the naked eye and very bright on a long exposure photograph. An observer from the Swiss Telescope came out to check out the skies as well.