 This makes Eris a little smaller than Pluto by area and diameter, which is across, although Eris is more massive.It also indicates an albedo of 0.96, higher than that of any other large body in the Solar System except Enceladus.It is speculated that the high albedo is due to the surface ices being replenished because of temperature fluctuations as Eris's eccentric orbit takes it closer and farther from the Sun.