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WFIRST's primary mirror
Although its primary collection optic will be a 2.4m-diameter mirror - the same size as the Hubble's, and much smaller than the James Webb Space Telescope's (JWST's) - the key advantage of WFIRST will be its enormous focal plane array, which will yield a field of view 100 times wider than Hubble. Photo: Harris Corporation / TJT Photography
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