00:01On this day in space.
00:03In 2015, a spacecraft flew by Pluto for the very first time.
00:07NASA's New Horizons spacecraft spent 9 and a half years making the 3 billion mile journey to Pluto.
00:13When it finally arrived, it took some amazing photos of the dwarf planet's surface.
00:17Most notably, the photos revealed that Pluto has a huge heart-shaped plane, tall mountains, and icy volcanoes.
00:23The mission also found that Pluto and its largest moon, Charon, are tidally locked,
00:27which means that Pluto's heart is always facing Charon, and the same side of Charon is always facing Pluto.
00:32It also seems to be borrowing some atmosphere from Pluto, which appears as a big red spot on Charon's North Pole.
00:38And that's what happened on this day in space.
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