The ESA has just released this stunning ultra high definition timelapse video, combining 12,500 images taken by astronaut Alexander Gerst during his six-month mission aboard the International Space Station. The views of sparkling cities, glowing aurorae and flashes of lightning are breathtaking. Watch it. Now.
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I never tire of these. But what is that green line at the top of the atmosphere? It seems to be a bit below the base of the aurorae, and sometimes looks red.