For most of human history, Earth has been known as the “Pale Blue Dot,” a term popularized by astronomer Carl Sagan when referring to the iconic 1990 image taken by Voyager 1. But for billions of ...

We are so used to the oceans being blue we use it as a signifier everyone recognizes on maps. However, the color is not inevitable, and new evidence has emerged that green was the dominant color for a ...