Pluto Flyby Turns One! New Horizons Mission Celebrates Anniversary

One year ago today, NASA's New Horizons spacecraft lifted the veil on mysterious, faraway Pluto. New Horizons' observations revealed Pluto to be a staggeringly complex and dynamic world, with towering water-ice mountains, vast plains of frozen nitrogen, surprisingly blue skies and a myriad of other intriguing features, including a huge "heart" that found its way onto Twitter feeds and T-shirts around the globe.