A future without oxygen: Scientists explain what Earth could look like in a billion years - hostile to complex life long before the Sun dies out

Earth's breathable atmosphere is a temporary phenomenon, experts predict. Computer simulations show oxygen loss within one billion years, long before the sun ages. This event will render the planet uninhabitable for oxygen-dependent life forms. Anaerobic organisms, however, will likely continue to survive in oxygen-free environments. This research also impacts the search for alien life on exoplanets.