From the cratered companion that lights Earth's night sky to the hundreds of icy worlds circling the Solar System's giant ...

Have you ever looked into the stars in the night sky and asked yourself questions like “What else is out there?” The universe ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...

Far from the Sun’s heat, orbiting the outer planets of the solar system, are moons with oceans of liquid water beneath their frozen surfaces. Keith Cooper finds out how planetary scientists are ...

Two massive planets may have once existed in early solar system before being ejected, leaving behind evidence in unusual ...

As the United States prepares to celebrate its 250th anniversary, the history of the solar system tells its own story of ...

Add Yahoo as a preferred source to see more of our stories on Google. (Ianm35/iStock/Getty Images Plus) The Solar System is one of the comforting constants of human existence. No matter what else we ...

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming into view, revealing hints of a surprising past – and the origin of Saturn's ...

The outer planets of the solar system are swarmed by ice-wrapped moons. Some of these, such as Saturn's moon Enceladus, are known to have oceans of liquid water between the ice shell and the rocky ...

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our ...