Neil deGrasse Tyson Explains Once and for All Why Pluto Is Not a Planet

One of astrophysicist Neil deGrasse Tyson's claims to fame was his assertion that Pluto is not a full-on planet, but a planetoid. In an appearance on Late Night With Seth Myers, Tyson confronts Pluto and lays out the logic governing NASA's decision to demote it to mere dwarf planet. We're convinced.

[viaGizmodo]