Nearly three-fourths of Earth is covered by oceans, making the planet look like a pale blue dot from space. But Japanese ...

In the waters off Iwo Jima, a volcanic island in Japan’s Satsuma archipelago, the sea has a distinct green tint. It’s not ...

NASA ...

For most of human history, Earth ... image taken by Voyager 1. But for billions of years before that, our planet’s oceans were not blue at all. Instead, they were a striking shade of green ...