January[]
- January 15: The Stardust landing capsule lands on Earth.
- January 19: New Horizons spacecraft is launched.
March[]
- March 6: Hyrrokkin, S/2006 S 1, Kari, S/2006 S 3, Greip, Loge, Jarnsaxa, Surtur, and Skoll are discovered.
June[]
- June 13: 132524 APL is visited by New Horizons.
July[]
- July 21: Salacia‘s moon Actaea is discovered.
October[]
- October 24: MESSENGER makes a flyby of Venus.
Unknown Date[]
- Pluto and four other objects are demoted to Dwarf planet status.