Telescope
An instrument that gathers and magnifies light or radio waves from distant objects, serving as the basic observing tool of astronomy.
When the Hubble Space Telescope launched in 1990, its mirror was off by 2.2 micrometers due to a miscalibrated polishing device. Its blurry images became a global embarrassment. In 1993, NASA astronauts aboard a Space Shuttle installed corrective optics, and Hubble finally worked.
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