The Milky Way crosses the sky over two of the Auxiliary Telescopes. The sky looked pretty dark to the naked eye but in the long exposure it turned out to be full of strong red airglow. Around sunset, there are usually lots of satellites visible crossing the sky, and a few can be seen in this photo.
This is ESO's reprocessing of the image, which removed almost all the airglow, though I quite like the contrast.
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