In 2005 a new dwarf planet was discovered at the edge of our solar system by Professor Mike Brown. The existence of Eris put Pluto's 75-year planet status under question. Watch more from Witness History: https://bbc.in/3BSg12l | BBC World Service

The Discovery Of Pluto. | Cosmoknowledge

151K views · 2.2K reactions | Discovered 40 years ago today, Charon, the largest of Pluto's five moons, fueled the dwarf planet’s evolution from a telescopic dot into an actual planetary system – and a source of many discoveries yet to come: https://go.nasa.gov/2K0qb9D | NASA - National Aeronautics and Space Administration | Facebook