On March 23, 2178, Pluto will complete one full orbit around the Sun since it was discovered in 1930—a rare and meaningful moment in astronomy. Pluto needs about 248 Earth years to make one trip around the Sun. Its orbit is very different from the eight major planets. Instead of being nearly circular, Pluto’s path is highly stretched and tilted. Because of this unusual route, Pluto can sometimes travel closer to the Sun than Neptune, which happened from 1979 to 1999. When astronomer Clyde Tombau