Possible Pluto Moons . ... Credit Copyright: H. Weaver ( JHU / APL ), A. Stern ( SwRI ), and the HST Pluto Companion Search Team , ESA , NASA Explanation: In 1930 , tiny, icy world Pluto was discovered orbiting in the distant solar system. In 1978, its relatively large companion Charon was detected by ground-based observations. This year, the Hubble Space Telescope may well have detected two further members of the Pluto system . ... NASA Web Site Statements, Warnings, and Disclaimers . ...