WETENSCHAP
Oude ruimterots heeft mogelijk leven geholpen
October 23, 2024 - Geological evidence from South Africa’s Barberton Greenstone Belt suggests that a huge meteorite impact boiled the oceans but also helped early lifeforms thrive on Earth.
“We think of impact events as being disastrous for life,” said Professor Nadja Drabon, a geologist at Harvard University.
“But what this study is highlighting is that these impacts would have had benefits to life, especially early on -- these impacts might have actually allowed life to flourish.”
Prof. Drabon and her team have now re-constructed what meteorite S2 did when it violently smashed into Earth.
Analysis published in the Proceedings of the National Academy of Sciences journal suggests that S2 triggered a tsunami that mixed up the ocean and flushed debris from the land into coastal areas.
Prof. Drabon said the impact’s heat boiled off the top layer of the ocean, heating the atmosphere, while a thick cloud of dust blanketed the planet.
However, according to the research, bacterial life rebounded quickly, bringing sharp spikes in the populations of single-celled organisms that feed off phosphorus and iron.