| 2023-11-23 | Second-most massive of the solar system's known dwarf planets |
| 2022-11-27 | It has only one-sixth of the mass of Earth's moon |
| 2022-05-04 | Dog owned by a talking mouse |
| 2021-08-29 | Largest object in the Kuiper belt |
| 2021-07-02 | Classic Disney character who never speaks |
| 2020-02-17 | Demoted planet |
| 2019-10-18 | Underworld ruler |
| 2018-05-14 | Planet demoted to "dwarf planet" in 2006 |
| 2017-01-11 | Mickey Mouse's dog |
| 2016-12-07 | Designated dwarf planet since 2006 |
| 2015-08-03 | Former planet |
| 2014-08-16 | Recipient of a major downgrade in 2006 |
| 2013-11-19 | Dwarf planet whose moons include Charon and 12-Down |
| 2012-08-12 | Demotion victim of 2006 |
| 2010-04-19 | Ninth planet no more |
| 2009-08-27 | Mickey Mouse's puppy pal |
| 2008-04-20 | 2006 neologism meaning "to demote" |
| 2008-03-11 | A dwarf planet, now |
| 2006-06-19 | Planet whose name is a Disney character |
| 2004-09-15 | Astronomical discovery of 1930 |
| 2003-06-08 | Disney dog |
| 2001-05-13 | Cartoon canine |
| 2000-10-11 | Ruler of Hades |
| 2000-07-17 | Distant planet |
| 2000-06-09 | It's about 2,100 miles in diameter |
| 1999-10-17 | Disney dog |
| 1995-08-31 | Disney pooch |
| 1995-05-10 | Disney dog |