Jasmine Wright and Margaret Myers Via PBS.org:
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Hubble’s contributions to space exploration are countless. Its images, explains Hubble Space Telescope Senior Project Scientist Jennifer Wiseman, have shown the first definitive detection of supermassive black holes at the centers of galaxies. They also have provided measurement of the expansion rate of the universe, and detection (along with ground-based telescopes) of acceleration in that expansion, caused by mysterious “dark energy” that appears to be pushing the universe apart.
“Hubble will go down in history as having changed the textbooks by totally revolutionizing humanity’s view of the universe, and our place in it,” Wiseman says.