- Planet X-4: Pluto is a Planet; so is Eris; so is Sedna; and so are Charon, the Moon, Ceres, Titan and Quaoar (): Hang on – I thought you said...?
- Planet X-3: Pluto Still Isn't a Planet, Neither Are 2003 UB313 and 2003 EL61 ()
- Planet X-2 ()
- Planet X ()
- Pluto Isn't a Planet ()