Aerobic respiration began hundreds of millions of years earlier than previously thought, a new study suggests.

Oxygen fills the air today, but for most of Earth’s early history it barely existed. Scientists say the atmosphere did not hold steady oxygen until about 2.

Oxygen is everywhere on Earth today. But that hasn’t always been the case. Scientists think oxygen only became a lasting part ...

Image: Even low concentrations of oxygen can have profound effects on ocean chemistry Photo of Australia’s red-weathered hills. Credit: Ariel Anbar, ASU Scientists widely accept that around 2.4 ...

Scientists have discovered oxygen is being produced extremely deep below the ocean's surface, changing how we think about life at the bottom of the sea. Researchers discovered the presence of strange ...

"Dark oxygen" is being produced deep in the ocean, and scientists are baffled by the strange phenomenon, according to a new study. In science class, kids learn that plants need sunlight to do ...

You are taught early in science that oxygen on Earth comes from sunlight. Plants, algae, and cyanobacteria use light to split water and release oxygen, shaping the atmosphere and making complex life ...

Most people believe rainforests are the lungs of our planet, pumping out vast amounts of the oxygen we breathe. This compelling image has shaped environmental campaigns and political speeches for ...

Oxygen, the molecule that supports intelligent life as we know it, is largely made by plants. Whether underwater or on land, they do this by photosynthesizing carbon dioxide. However, a recent study ...