Since the beginning of time, the moon has been our loyal companion in the sky. But other planets also have satellites, more so than 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 about and do they actually even carry primitive life? In this new SPACETIME episode, astronaut and scientist Ulrich Walter is dedicated to the silent companions in our planetary system.
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