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 ...

ranging from irregular town-size space rocks to massive rounded bodies that are potentially big enough to be considered planets in their own right. So exactly how many solar system moons have we ...

Narrator: Serious scientists, like myself, believe our solar system was formed by the collapse of a giant cloud of gas and rock and is held together by the gravitational pull of the Sun.