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802 days ago
Before and after and present-day images of the spiral galaxy Messier 100. Hubble suffered from a spherical aberration--a flaw only 1/50th the thickness of a sheet of paper in its primary mirror caused focusing problems. It was fixed in a December 1993 mission (http://j.mp/ZN3eDj) and after 20 years of upgrades, Hubble has an even better view (http://j.mp/ZGRrdU).