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Mars, Rätsel einer alten Welt: Astronomie & Exobiologie ☆ Helmut Lammer, bei cropfm
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![Sommes-nous seuls dans l'Univers ? — Le paradoxe de Fermi [Astrobiologie #3]](https://img.youtube.com/vi/tMkpjjjDRYI/maxresdefault.jpg?cc_load_policy=1 "Sommes-nous seuls dans l'Univers ? — Le paradoxe de Fermi [Astrobiologie #3]")
