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

Happy Earth Day! Activism on behalf of the Big Blue Marble is heating up — but, sadly, so is the planet itself. Earth — so hot right now. The Earth’s surface temperature is rising thanks to ...

Pettit posted his striking footage on social media on Tuesday. The American astronaut used a wide-angle lens to get the entirety of the seven-window Cupola module in the video, using the panels to ...