Comets, according to current theory, are a bit like cosmic storks that delivered the ingredients from which life could be made to a baby Earth billions of years ago.
. But that freezing cold distance from the Sun, coupled with the extreme darkness of the oceanic depths, means that life wouldn't be able to rely on a photosynthetic food web, as the vast majority of life on Earth does.in Earth's light-starved depths. Clustered around hydrothermal vents that spew heat and chemicals from the ocean floor is an entire ecosystem based on chemosynthesis – harvesting chemical reactions, rather than sunlight, to produce energy.
, after all, although not a huge number, because tectonic activity creates ice plumes and volcanoes that cover them up in pretty short order.is no stranger to bombardment – and those impact craters that have been identified show concentric ripples that suggest significant melting followed by subsurface movement after the impact.
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