Billions of years ago, our planet did not have the deep blue oceans we admire today. Instead, they were actually […] ...

Although the Earth’s been decidedly blue for 600 million years, rising populations of phytoplankton caused by rising temperatures are once again causing the world’s oceans to turn green.

Earth’s oceans have remained blue for hundreds of millions of years, but scientists say that’s now changing. A 2019 study from MIT predicted that half of the world’s oceans could turn green ...

Today, the world's oceans appear deep blue, contrasting with the light ... which would have made Earth look green from a distance. Over the green-ocean period, the researchers note, the ...

For a long stretch of Earth’s history, our planet might have looked green from a distance, instead of the pale blue dot we know today. Earth’s green period, which lasted from around 3 billion ...

The green-tinged Comet Nishimura is zipping past Earth, and you have a few days to ... from the sun vaporizing its ice — is a "pleasing blue-green color," King added. Read next ...