Pluto, the smallest and most remote planet in our solar system, is one that is yet to be "explored" by U.S. spacecraft. Percival Lowell began the search for another planet which resulted in the Pluto's discovery by Clyde W. Tombaugh on February 18, 1930. The body was named for the mythological character Pluto, brother of Jupiter and Neptune. Pluto, the planet, has an orbit that brings it inside the orbit of the planet Neptune during the former's close approach to the Sun. Their actual orbital paths do not cross.