A hidden source of clean energy could power the planet for more than a hundred thousand years if tapped into, according to ...

The deep blue sea may not have always been so blue. A new study suggests that the Earth's oceans may have changed color over ...

In photos The details in this photograph include the airglow of the atmosphere dividing Earth from space — yellow-green at an ...

For ages, Earth ... blue planet, a vision largely shaped by the vast oceans that cover three-quarters of its surface. But what if this wasn't always the case, and our oceans used to be green?