3. It's the first time several people are seeing a new planet ... and the last time for us all. The 1960s had Venus and Mars, the 1970s enjoyed a trifecta of Mercury, Jupiter and Saturn, and the 1980s relished in the sights of Neptune and Uranus.
This week, we were given the chance to see a new world for the first time again. Bittersweet as it may be, this mission also means the end of the initial tour of all nine planets in our solar system.
4. The mission will teach us more about Earth. Scientists wanted primarily to learn more about Pluto because it is believed to have formed from similar materials as Earth, meaning it also went through similar early stages of growth. The new data will help scientists understand more about the place we call home.
5. It reminds us how little we are, and how vast the world beyond Earth is. Pluto takes 248 Earth years to orbit the sun, so one orbit spans the entirety of U.S. history. This means when Pluto was last in the position it's currently in, humans didn't even know it existed.
This mission just proved that quite a lot can change in a single orbit.