Green oceans on early Earth, shaped by iron, pushed microbes to evolve light-absorbing tools that worked in green light.

From outer space observatories, one sees Earth’s oceans showing a blue appearance, but this color has never been permanent over their existence. Multiple types of evidence from the past and present ...

It will lead to more purple, brown, or green hues in coastal or stratified areas, with less deep blue color in water as ...

A study by Japanese researchers, published in the Nature journal, has also made the argument that the Earth's oceans used to be green, rather than blue. They landed on the conclusion after first ...

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, in a study published in Nature. The reason Earth's ...