In 2005 Mike Brown discovered Eris which was slightly larger than Pluto. This discovery sparked a series of international debates resulting in the demotion of Pluto to a dwarf planet. Brown recounts his controversial discovery in this part memoir and part planetary saga in How I Killed Pluto and Why It Had It Coming.
Barrie W. Jones' Pluto: Sentinel of the Outer Solar System delves into discussions of scientific discovery as well as an exact account on Pluto, its satellites and its controversial re-classification.