Editing 2005 in science (section)

==Astronomy==
* January 5 – [[Eris (dwarf planet)|Eris]], the most massive known [[dwarf planet]] in the [[Solar System]], is identified by a team the Palomar Observatory in California from images taken on October 21, 2003 (discovery announced July 29, 2005).
* February 23 – Astronomers announce the discovery of a galaxy, [[VIRGOHI21]], that consists almost entirely of [[dark matter]].<ref>{{cite journal|author=Minchin, Robert|title=A Dark Hydrogen Cloud in the Virgo Cluster|journal=[[The Astrophysical Journal]]|volume=622|year=2005|pages=L21–L24|doi=10.1086/429538|bibcode=2005ApJ...622L..21M|issue=1|arxiv = astro-ph/0502312 |s2cid=15639006|display-authors=etal}}</ref>
* March 23 – Two independent teams report the observation of light from [[planet]]s circling two different [[star]]s, using the [[Spitzer Space Telescope|Spitzer]] [[infrared]] [[space telescope]]. Both groups detect a during [[Conjunction (astronomy)|conjunction]], when the planet is moving behind its sun's disk ([[occultation]]).<ref>{{cite web|author=Cornell University|title=Light detected from two planets outside solar system|url=http://www.spaceflightnow.com/news/n0503/22exoplanets/|work=Spaceflight Now|date=2005-03-22|accessdate=2011-12-08|author-link=Cornell University}} Results are published in ''[[Nature (journal)|Nature]]'' and ''[[The Astrophysical Journal]]''.</ref>
* March 31 – Dwarf planet [[Makemake]] is discovered in the [[Kuiper belt]] (discovery announced July 29).
* April 8 – [[Solar eclipse of April 8, 2005|Total solar eclipse]].
* May 18 – A second photograph by the [[Hubble Space Telescope]] confirms the discovery of two new moons of [[Pluto]]: [[Nix (moon)|Nix]] and [[Hydra (moon)|Hydra]].
* July 20–27 – [[Controversy over the discovery of Haumea]]: Discovery of dwarf planet [[Haumea]] is announced.
* October 3 – [[Solar eclipse of October 3, 2005|Annular solar eclipse]].
* October–November – Japanese [[robotic spacecraft]] ''[[Hayabusa]]'' makes a rendezvous with [[near-Earth asteroid]] [[25143 Itokawa]].