The "Blue Marble" was the first photo of the whole Earth and the only ever taken by a human. Fifty years on, new images of ...

Green oceans on early Earth, shaped by iron, pushed microbes to evolve light-absorbing tools that worked in green light.

It's out there all by itself." The Blue Marble image was captured at around 29,000km (18,000 miles) from Earth, as the Sun lit up the globe from behind the Apollo 17. Almost six hours into the ...