Billions of years ago, our planet looked very different, including its coloring. New research suggests that early oceans were ...

Our tiny blue planet has been immortalized in breathtaking images captured from the far reaches of space. These photographs, ...

Blue-green algae, also called cyanobacteria, were one of the earliest life forms on Earth and contributed heavily to the oxygenation of the planet.

Nearly three-fourths of Earth is covered by oceans, making the planet look like a pale blue dot from space. But Japanese researchers have made a compelling case that Earth's oceans were once green ...

Were Earth’s oceans once green? (Image credit: 100Y Design via Shutterstock) Nearly three fourths of Earth is covered by oceans, making the planet look like a pale blue dot from space.