In 1995, NASA astronomer Robert Williams chose to point the Hubble Space Telescope at one of the darkest-looking patches of sky for about 100 hours. Critics called the plan a waste of valuable telescope time and warned that he might have to resign if the image came up empty. Instead, the exposure revealed more than 3,000 galaxies in a tiny region only about 1/30th the width of the full Moon, producing the famous Hubble Deep Field image.
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