Earth's history to be rewritten: Oxygen appeared 700 million years earlier than previously thought

Until now, science has believed that oxygen in the Earth's atmosphere has been around for roughly 2.3 billion years, or roughly half way back along our planet's 4.6 billion year timeline. However, new research results provide evidence that the dating of a so-called “Great Oxygenation Event” needs a 700- million-year backwards recalibration.

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