6.8K views · 119 reactions | When Pluto was downgraded to a dwarf planet in 2006, it caused quite a stir. This Space Saturday, we take a look at what it means to be a dwarf planet in our solar system. | National Geographic TV | Facebook

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