Question: how much bigger is eris than pluto?
Answer: It is also the largest object that has not been visited by a spacecraft. Eris has been measured at 2,326 ± 12 kilometers (1,445.3 ± 7.5 mi) in diameter. Its mass is 0.27% as much as the Earth's and 27% more than dwarf planet Pluto's, though Pluto is slightly larger by volume.