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Hubble
Space Telescope
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The Hubble
Space Telescope, free of the distorting effects of the earth's
atmosphere, has an unprecedented view of distant galaxies.
Placed in orbit in 1990, scientists discovered soon after the
telescope became operational that its 240-cm (94.5-in) primary
mirror was flawed. However, a repair mission completed by space
shuttle astronauts in December 1993 successfully installed
corrective optics which compensated for the flawed mirror.
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