2006 ⟶ Pluto Reclassified as a Dwarf Planet

The International Astronomical Union creates the first forma...
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Year
2005
2006
2015
2017

🪐 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

🔭 New Horizons and Dawn Spacecraft Transmit First Close-Up Images of Ceres and Pluto

First close-up images of Ceres and Pluto.⟶
New Horizons and Dawn Spacecraft Transmit First Close-Up Images of Ceres and Pluto (2015)
Space ExplorationAstronomyPlanetary ScienceSolar SystemNASADwarf Planets
United StatesUnited States

☄️ 'Oumuamua: First Interstellar Object Identified

October 28: 'Oumuamua, the first known interstellar object, is identified.⟶
'Oumuamua: First Interstellar Object Identified (2017)
AstronomySpace ExplorationDiscoverySolar SystemCosmology