If you don't know, undersea vents are superheated water that are expelled from the ocean floor, where it is very deep and reaches very near to the mantel of the earth. We have previously seen some animals living very low around these vents which provide heat and nutrients for some life forms.
Because we found life down here, there is some thought life on frozen worlds (3 - 4 moons orbiting Jupiter) can develop. Interestingly, one of these scientists is very open that he doesn't care about other worlds. He thinks there are still lots to discover and understand here on earth.
article (NY Times so there might be a pay wall)
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