Buzz Aldrin and Neil deGrasse Tyson celebrate the 80th anniversary of Pluto’s discovery

Eighty years ago an astronomer named Clyde Tombaugh, who worked at the Lowell Observatory in Flagstaff, Arizona, made a discovery that would capture the imagination of space enthusiasts for generations. He found Pluto.

In honor of that discovery, we hear from Buzz Aldrin, retired astronaut and the second man to step on the moon, and astrophysicist Neil deGrasse Tyson about our fascination with planets ? “dwarf” or otherwise ? and the future of space exploration.