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.

Earth isn't alone in orbiting our sun; it's joined by a bunch of planets, moons, asteroids, and comets that we collectively ...

From Jupiter's swirling storms to Neptune's icy depths, planets across our solar system are orbited by a fascinating cast of moons. Some are massive and geologically active, while others are tiny, ...