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On this day: May 20

POSTED: 02:26 PM PDT May 17, 2013    UPDATED: 11:00 PM PDT May 19, 2013 

Vasco da Gama arrives in India, Christopher Columbus dies, Norman Rockwell makes his Saturday Evening Post cover debut, HIV is discovered, and "Cheers" airs its series finale, all on this day.

OTD May 20 - Hubble images
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NASA

1990: The Hubble Space Telescope sends its first photograph from space, an image of a double star 1,260 light years away. While the telescope clearly exceeded the best ground-based telescopes, scientists soon began to realize that the images weren't as sharp as they were supposed to be. Analysis of the flawed images revealed that the primary mirror had been ground to the wrong shape. Corrective optics to fix the problem were installed during the Hubble's first servicing mission in December 1993.

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