Add Yahoo as a preferred source to see more of our stories on Google. A blue, green and white sphere surrounded by orange swirls. Scientists believe Earth may have briefly lost protection from the sun ...

Two million years ago, an encounter with a cold cloud of gas and dust could have caused our planet's "protective giant bubble" to draw back, potentially cooling our planet, new research claims. When ...

Around two million years ago, Earth was a very different place, with our early human ancestors living alongside saber-toothed tigers, mastodons, and enormous rodents. And, depending on where they were ...

Around two million years ago, Earth was a very different place, with our early human ancestors living alongside saber-toothed tigers, mastodons, and enormous rodents. And, depending on where they were ...

Stargazers call a prominent dark black region in the Southern Hemisphere’s night sky the Coalsack. Even for naked-eye observers, the cloud of cold gas that makes up the Coalsack is hard to miss: It ...