Pluto has a thin atmosphere with a blue tint. Find out what else makes the "King of the Kuiper Belt" interesting. Stream "The Planets: Ice Worlds" online or on the @PBS app now: https://to.pbs.org/2YztewN | NOVA l PBS

Ever wondered what makes Pluto so unique? From the unexpected story behind its name to just how cold it really is on its surface, these five facts about this distant planet will surprise you. | National Geographic