1483 ⟶ Pluto Enters Neptune's Orbit

Pluto moves inside Neptune's orbit until July 23, 1503, acco...
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1483
1978
1989
2005
2006

🪐 Pluto Enters Neptune's Orbit

Pluto moves inside Neptune's orbit until July 23, 1503, according to modern orbital calculations.⟶
Pluto Enters Neptune's Orbit (1483)
AstronomyPlanetary ScienceSolar SystemOrbital MechanicsCelestial BodiesMathematics

🪐 Charon, Pluto's Moon, Discovered

June 22: Discovery of Pluto's moon Charon.⟶
Charon, Pluto's Moon, Discovered (1978)
AstronomySpace ExplorationPlanetary ScienceKuiper BeltSolar SystemCelestial BodiesDiscovery
United StatesUnited States

🪐 Voyager 2's Closest Approach to Neptune and Triton

August 25: Voyager 2 makes its closest approach to Neptune and its largest moon, Triton.⟶
Voyager 2's Closest Approach to Neptune and Triton (1989)
Space ExplorationVoyager ProgramPlanetary ScienceAstronomySpacecraftNASASolar System
United StatesUnited States

🪐 Dwarf Planet Eris Discovered

July 29: Michael E. Brown confirms the discovery of the dwarf planet Eris.⟶
Dwarf Planet Eris Discovered (2005)
AstronomyPlanetary ScienceSolar SystemSpace ExplorationKuiper Belt
United StatesUnited States

🪐 Pluto Reclassified as a Dwarf Planet

The International Astronomical Union creates the first formal definition of a planet, which drops Pluto's classification as a planet.⟶
Pluto Reclassified as a Dwarf Planet (2006)
AstronomyPlanetary ScienceDwarf PlanetsSolar SystemCosmology