S1, E5: Pluto is so far away from Earth that it is a mere pinprick of light in our powerful telescopes. Locked in a gravitational dance with its largest moon Charon, this frozen outpost is simply the first discovered body in an unseen swarm of icy worlds. Learn what it would take for humans to journey to the uncharted limits of our solar neighborhood and what NASA scientists think we'll find when we get there.