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

5.6K views · 103 reactions | On the anniversary of Pluto's discovery, here are five things you might not have known about the dwarf planet  | Reuters | Facebook