The catalog of known worlds beyond our solar system has crossed another threshold. NASA’s official tally now exceeds 6,000 confirmed exoplanets, a figure that has continued climbing on a rolling basis ...

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 ...

One of the most notable properties of the giant planets in our solar system—Jupiter, Saturn, Uranus and Neptune—are the extreme winds observed around their equators. While some of these planets have ...

The featherweight pair — orbiting a star 1,110 light-years away — are the biggest exoplanets found to have less density than ...