Learn about The Hubble Space Telescope in this educational video from dizzo95.
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Female Speaker: Designed to answer questions like how old is the universe and do black holes existed the course of galaxies, the Hubble telescope has been plugged by improperly ground optics and other problem 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, it has showed that the repaired machine 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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