Over time, the cyanobacteria in the sea would have been using the sun's energy ... the deep blue shade we know today. In the ...

Researchers have found that Earth’s first oceans may not have been blue at all like today. Instead, they may have gleamed in shades of green for billions of years. Although Earth formed about 4.5 ...

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