Oxygen is abundant on Earth. It's actually the third most plentiful element in the entire universe, behind hydrogen and helium. Yet the further you get from our home planet, the less oxygen there will ...

Outer space is an inhospitable frontier. Astronauts are not only cut off from gravity but also from all the resources ancient explorers took for granted, especially oxygen. Sure, you can grow fruit in ...

It's long been thought that photosynthesis was basically the only way that oxygen is naturally generated on Earth (some bacteria can also produce oxygen by breaking down nitrates). But a new study has ...