Pluto Might be Bigger, But Eris is More Massive

Pluto is no longer considered a planet but a dwarf planet. Did you know that in 2005 another dwarf planet, Eris, was discovered in our solar system? New observations now found Pluto to be bigger, but Eris to be more massive.

Pluto Might be Bigger, But Eris is More Massive : Discovery News