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

Snapchat Planets turns your friendship ranking into a tiny social solar system, where being Mercury is elite and Neptune ...

For more than a century, people have wondered whether our solar system's planetary count really stops at eight. The idea ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...