No comments Dwarf Planet Eris Mike Brown On Discovering Dwarf Planet Eris By Ilana Faber • December 23, 2014 Uncategorized Mike Brown is an American astronomer who is credited with discovering the dwarf planet Eris. Eris is larger than Pluto, and Brown is thus known as the man who “killed Pluto” because he furthered Pluto being downgraded to a dwarf planet.