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Tag: “support complex life”

A view of Earth's atmosphere at sunset as seen by the International Space Station Expedition 23 crew in 2010. Colors here roughly denote the various layers of the atmosphere. (NASA)

Earth’s Atmosphere Got Its Oxygen in Periodic Bursts Over a 100 Million Year Period

November 20, 2015

For about the first 2.1 billion years of Earth’s history, its atmosphere didn’t have enough oxygen to support complex life. Scientists believe that Earth’s first atmosphere,formed after its creation, was probably made up of hydrogen and helium. Then as a result of volcanic eruptions that spewed gases from Earth’s interior, in a process known as […]

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