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There is increasing evidence for subterranean oceans on moons and even dwarf planets in our solar system. “Ocean worlds appear to be ubiquitous. The vast abundance of liquid water hidden beneath the ice on these moons could be the largest volume of habitable real estate in our solar system.”


Several spacecraft are currently en route to the outer solar system to search for insights about that very mystery. If we ever do find life on these worlds—whether they be simple microbes or fantastical space whales—they might be literally in the dark about the great cosmic drama that is unfolding around us.

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