Transcription: designed to answer questions like, how old is the universe? And do black holes exist at the cores of galaxies? The Hubble telescope has been plagued by improperly ground optics and other problems since its deployment in 1990. In December of 1993, seven astronauts lifted off from Earth to fix it. They installed new optics and made several other repairs over a period of 12 days. Several days later, tests showed that the repair mission was a success. And in early 1994, the Hubble telescope found evidence for black holes in a galaxy millions of light years away.
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