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The WMAP was preceded by two missions to observe the CMB; (i) the Soviet [[RELIKT-1]] that reported the upper-limit measurements of CMB anisotropies, and (ii) the U.S. [[COBE]] satellite that reported large-scale CMB fluctuations, and the ground-based and balloon experiments measuring the small-scale fluctuations in patches of sky: the [[BOOMERanG experiment|Boomerang]], the [[Cosmic Background Imager]], and the [[Very Small Array]]. The WMAP is 45 times more sensitive, with 33 times the angular resolution of its COBE satellite predecessor.<ref name="2008Limon">Limon et al. (2008)</ref>
==Sviluppo==
[[Image:BigBangNoise.jpg|thumb|Paragone tra le sensibilità del WMAP e del COBE. I dati sono simulati]]
La missione MAP venne proposta alla [[NASA]] nel [[1995]], selezionata per uno studio approfondito nel [[1996]] e approvata per lo sviluppo definitivo nel [[1997]].ref name="news_facts">{{cite web | url=http://map.gsfc.nasa.gov/news/facts.html | title=news sul WMAP: fatti | publisher=NASA | date=[[22 April]] [[2008]] | accessdate=2008-04-27}}</ref><ref name="news_events">{{cite web | url=http://map.gsfc.nasa.gov/news/events.html | title=WMAP News: Events | publisher=NASA | date=[[17 aprile]] [[2008]] | accessdate=19 febbraio 2009}}</ref>
==The spacecraft==
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