Uranus' accidental discovery 240 years ago greatly enhanced our understanding of the solar system, doubling the size of the solar system as we knew it at the time. Here's how a German astronomer ...

Theorbits of Jupiter, Saturn, Uranus and Neptune may have been altered by the fly-by of an enormous object from deep space, billions of years ago. According to a pre-print research paper, which is yet ...

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 ...