http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=48901
Another milestone in the development of Gaia, ESA's ultra-sensitive space astrometry mission, was passed on 1 June when the 106 electronic detectors of its billion pixel camera were assembled like a large mosaic for the first time.
During its ambitious mission to map one thousand million stars, the spinning Gaia spacecraft will monitor each of these pinpoints of light up to 70 times over a five year period. In order to detect distant stars about one million times fainter than the eye can see, Gaia will carry 106 charge coupled devices (CCDs), each of which is, effectively, a miniature camera.
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