Dark & Twisty

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Are you Helmut Hornung, author of the books below?
Safari ins Reich der Sterne. Eine Einführung in die Himmelsku... by Helmut Hornung Schwarze Löcher und Kometen. Einführung in die Astronomie. by Helmut Hornung Astronomische Streiflichter. Sternbilder, Gestirne und ihre G... by Helmut Hornung Streifzüge durch das All by Helmut Hornung 星の王国の旅―宇宙・天文学への招待 by Helmut Hornung


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