Were Earth’s oceans once green? 100Y Design/Shutterstock. ... But Japanese researchers have made a compelling case that Earth’s oceans were once green, in a study published in Nature.

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.

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 ...

If we discover a green-tinted world, it could mean that early photosynthetic organisms are thriving there, just like they once did on ancient Earth. Earth’s green oceans may be long gone, but ...

Pale green dot. The oceans were likely once a vibrant green color between 3.8 and 1.8 billion years ago, according to a study published in the journal Nature Ecology & Evolution.During this period ...

What follows is a collection of design principles that various individuals and groups have proposed over time to answer that question. Most people stop at 12 principles, and most separate chemistry ...