When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: rbkomar/Getty Images Earth isn't alone in orbiting our sun; it's joined by a bunch of ...

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

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.