You can take a tour through the history of Pluto exploration tonight (Nov. 19) at 7:30 p.m. EST (0030 GMT on Nov. 20).
Sky & Telescope magazine Senior Editor Kelly Beatty will give a talk called "Rediscovering Pluto," during an event organized by the Harvard-Smithsonian Center for Astrophysics (CfA). You can watch it live in the window below, courtesy of the CfA, or on the CfA's "Observatory Nights" YouTube channel: https://www.youtube.com/watch?v=rLEsQuLTW5A
From the CfA:
In mid-July, NASA's New Horizons spacecraft flew past Pluto after a 9-1/2-year journey. But really this historic encounter has been 85 years in the making, ever since 24-year-old Clyde Tombaugh discovered this enigmatic body at the edge of our planetary system. Today we realize that Pluto is among the largest objects in the Kuiper Belt, even though initially it was believed to be a body perhaps as massive as Earth. This presentation traces the history of Pluto — from predictions of its existence, to the discovery of its moons to its "demotion" to dwarf-planet status — and explores the amazing, unexpected findings revealed by New Horizons.