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There have been a number of problems with the Hubble Space Telescope over the years. Possibly the most serious was that the primary mirror of the telescope was incorrectly made; it was out of focus! Since there was no way to test it prior to launch, scientists didn't discover this until AFTER it had already been launched from the Space Shuttle and released into orbit. It was a GIANT disappointment. (The Hubble Space Telescope couldn't be tested on the ground, because the structure isn't strong enough to support its own weight in gravity.)

For almost a year, the Hubble's telescope was as blind as man with broken glasses. Another Shuttle mission was required to install a corrective lens and bring the pictures back into proper focus.

Since then the biggest problems have been batteries, computer systems and gyroscopes; several gyros have been replaced, and the main computer was replaced, and new more powerful instruments installed just this summer. At the moment, I believe that everything is working properly.

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