9. The dwarf planet Eris has no atmosphere and has been easier to measure than Pluto. At its largest, the diameter of Eris is 2,338 km. Pluto's largest diameter measures 2,379.8 km. a. As a percent difference, how much larger is Pluto than Eris at their largest diameters? b. As a percent difference, how much smaller is Eris than Pluto at their largest diameters