The solar system’s history is steeped in mystery, with suggestions of ancient chaos possibly casting out enormous planets.

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 ...

In the never-ending search for life beyond planet Earth, NASA scientists have uncovered the only other 8-planet solar system they know of that circles a sun. With help from Google--and their machine ...