Our cover picture ...
…shows NLCs (noctilucent clouds). The picture was taken shortly after the end of a short meteor observation in the night of 27/28 June 2021, when the bright Moon had already risen in the south east. The normal clouds in this direction appeared brightened by the Moon, while in the northern sky the low clouds stood out dark against the bright NLC. Time of exposure: 00:03 CET, that is, at the lowest position of the Sun. About an hour later, no more NLC were visible from Marquardt (north of Potsdam). (J. Rendtel, Canon EOS 6D, 2 s exposure at ISO 5000.)