Earth was once purple, not green! Early microbes used retinal, not chlorophyll, for photosynthesis, reflecting violet hues. This ancient color shift hints at alien life.

"We think about green plants and then blue oceans and then another pale ... planet abundant with similar biology to the purple bacteria on Earth would suggest the existence of more Kaltenegger ...

While the Earth is often called “the Pale Blue Dot” thanks to its bountiful ... don’t count on “little green men.” As for flying purple people-eaters... well, now we’re on to something.

Some scientists propose that Earth was once covered in shades of purple instead of green. The idea suggests early life forms used a different molecule for photosynthesis than today’s chlorophyll.

Nature is a master artist, painting the skies, waters, and landscapes with mesmerising hues. From celestial wonders to ...

Unlike the typical blue-and-green depiction of Earth, this photo shows the planet in a mossy green hue, framed by a thin ...

As the spring equinox approaches, northern lights hunters will scour the skies for breathtaking displays of color.

The image showcases two blue marbles, thanks to its mirror-smooth solar panel. The faint dot above Earth, which can be seen in the uncropped image below, is actually the moon, a destination to ...