Solar System's Run-In With 'Space Cloud' May Have Triggered a Series of Ice Ages 2 Million Years Ago, Says Scientists Around two million years ago, Earth underwent a series of temperature fluctuations ...

A few ounces of black asteroid rubble have become something like a forensic archive of the early solar system. Since NASA’s ...

Add Yahoo as a preferred source to see more of our stories on Google. Illustration of solar wind streaming from a fuming Sun drives auroras bright enough to be seen far from the poles, a dazzling ...

Super-Earth exoplanets are unlike any planets in our own solar system. They’re larger and more massive than Earth but smaller than Neptune. Those found so far were in orbits close to their stars. But ...

The source of Earth's water is an enduring mystery that extends to exoplanets and the notion of habitability. In broad terms, Earth's water was either part of the planet from the beginning of its ...