When were each of the planets first discovered and who did it?
Urbain Jean Joseph Le Verrier - NASA
StarChild: The Planets and Dwarf Planets - NASA
StarChild: The planet Mercury - NASA
John Couch Adams - NASA
Urbain Le Verrier - NASA
How do planets and their moons get their names? - NASA
John Couch Adams - NASA
StarChild: The Dwarf Planet Pluto - NASA
StarChild: The planet Mercury - NASA