January[]
- January 16: Tarqeq is discovered.
- January 18: S/2007 S 2 and S/2007 S 3 are discovered.
February[]
- February 22: Quaoar‘s moon Weywot is discovered.
- February 28: New Horizons visits Jupiter.
May[]
- May 30: Anthe is discovered.
June[]
- June 5: MESSENGER makes a flyby of Venus.
July[]
- July 17: Gonggong is discovered.
September[]
- September 27: The Dawn spacecraft is launched.
December[]
- December 31: Deep Impact makes a flyby of Earth.