This is the best summary I could come up with:

NASA astronaut Don Pettit captured it during his most recent visit to the orbiting laboratory in 2012.

Star trail view via fisheye lens from the Cupola module aboard the ISS.

A 360 degree view of Earth’s horizon shows green airglow in the lower part of the atmosphere (from atomic oxygen emissions), faint red airglow above the green (also due to atomic oxygen), purple aurora, and the soon to rise sun.

Cities at night form streaks from our orbital motion with an occasional flash of lightning as the purple spots.

A chemical engineer by training, Pettit was one of the real pioneers of astrophotography during his two previous stays on the ISS.

The good news is that Pettit is heading back to space later this year, in September, on a Soyuz spacecraft.

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