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Since the beginning of time, the moon has been our faithful companion in the sky. But other planets also have satellites, and more than the Earth. The silent companions of the planets are fascinating worlds of their own and there could even be candidates for extraterrestrial life among them. But what are moons really, how did they come into being and do they perhaps actually support primitive life? In this new SPACETIME episode, astronaut and scientist Ulrich Walter devotes himself to the silent companions in our planetary system. ???? More SPACETIME episodes • SPACETIME documentary series with Prof. Dr. Ul... ???????????? SPACE TRAVEL documentaries • DOCUMENTARY: Space travel ???? More documentaries & reports http://bit.ly/WELTdokus ???? Subscribe to the WELT YouTube channel http://bit.ly/WeltVideoTVabo #Spacetime #Monde #Doku