Theory of Earth's ancient atmosphere challenged

摘要

An international team of scientists are challenging the theory that ancient Earths atmosphere was low in oxygen. By extracting micrometeorites from Australian limestone, Dr Andrew Tomkins, from Monash University and his team think that ancient Earths upper atmosphere contained the same amount of oxygen as it does now. They believe a methane haze layer separated the oxygen-rich upper layer from the oxygen-starved lower atmosphere.