Deployed from Space Shuttle Discovery on 25 April 1990, the Hubble Space Telescope has made over 1.5 million observations and contributed to more than 20,000 scientific papers in its first three decades. Its deep-field images revealed that the universe contains over two trillion galaxies, its measurement of Cepheid variable stars helped pin down the Hubble constant, and its observations provided the first strong evidence for the accelerating expansion of the universe.
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