"What are some of the astronomical events that make it possible for there to be life on Earth?"
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Increased H2S in the Deep Ocean - Bad News for Life?
NAI scientists on the Penn State and University of Colorado teams published recently in Geology their studies showing that increases in the level of hydrogen sulfide in the deep ocean during oceanic anoxic periods in Earth’s history could cause elevated H2S levels in shallower waters and in the atmosphere. This may have caused, they propose, destruction of the ozone shield and an increase in atmospheric methane, and may have helped spell the end for life at several extinction events.
Source: [Link]
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