👉One trip around the Sun takes Pluto about 248 Earth years. Since Pluto was discovered in 1930, it won’t finish a full orbit after its discovery until March 23, 2178—a date far beyond any human lifetime so far. Pluto moves so slowly because it is extremely far from the Sun. Objects in the outer solar system travel along huge paths and take a very long time to circle the Sun. From the moment astronomers first spotted Pluto, it has been following its stretched, oval-shaped orbit, but it still has

In 2005 a new dwarf planet was discovered at the edge of our solar system by Professor Mike Brown. The existence of Eris put Pluto's 75-year planet status under question. Watch more from Witness History: https://bbc.in/3BSg12l | BBC World Service

Pluto has a thin atmosphere with a blue tint. Find out what else makes the "King of the Kuiper Belt" interesting. Stream "The Planets: Ice Worlds" online or on the @PBS app now: https://to.pbs.org/2YztewN | NOVA l PBS