One of the things I thought was neat about the New Horizons probe was that it was powered by Plutonium. Uranium was named after Uranus which was recently discovered at the time (The Constitution is about as old). When the next element was created, #93, it was named Neptunium. Since #94 was next planet it got the name Plutonium.
Although Pluto lost its lofty place in the sky as a planet, as an element it has the higher honor. Long after mankind has moved to other stars that element will retain that name . That Plutonium powered the first visit to Pluto highlights the honor!