Stars and waves

I have for a long time wanted to take pictures of the nightsky to see if the camera could "see" airglow. On our camping trip this weekend I had a great opportunity to try it out. Unfortunately I forgot the camera manual and couldn't figure out how to keep the shutter open. So I ended up taking a bunch of pictures with 30 seconds integration time and stack them together. I did not see any airglow, but saw a bunch of stars and the read-out amplifier signal :)