Scientists calculate life expectancy of Earth’s atmospheric oxygen

An artist’s interpretation of the atmosphere of Archean Earth, prior to 2.4 billion years ago. A new study suggests it may return to this oxygen-poor, methane-rich atmosphere in about 1 billion years’ time NASA’s Goddard Space Flight Center/Francis Reddy The Earth has an expiry date – in about five billion years, the Sun will expand and swallow up our home world. But it turns out life on Earth could have a much earlier end point. A new study has found…