"If our solar system is indeed moving this fast, we need to question fundamental assumptions about the large-scale structure ...

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars. When you purchase through links on our site, we may earn an affiliate commission.

The Oort Cloud, an expanse of icy bodies in the far reaches of our solar system, is shown here in a scene from "Encounters in the Milky Way," a show at New York City's Hayden Planetarium that spawned ...

What are the weirdest worlds in our solar system, and how did they come to be? From a dwarf planet that looks like a deflated football, to a tiny moon with cliffs taller than Mt. Everest, to the ...