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Astronauts John Grunsfeld (left) and Andrew Feustel performs repairs and upgrades on the Hubble Space Telescope during STS-125 extravehicular activity May 18, 2009 in Earth Orbit Stock Photo - Alamy
John M. Grunsfeld - Wikipedia
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Hubble Space Telescope - Wikipedia
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Astronaut John Grunsfeld performs work on the Hubble Space Telescope as the first of five spacewalks..., Stock Photo, Picture And Rights Managed Image. Pic. S98-1161110 | agefotostock
/cdn.vox-cdn.com/uploads/chorus_image/image/69892662/33433274343_277deba9eb_o.0.jpg "The Webb Space Telescope is 100x as powerful as the Hubble. It will change astronomy. - Vox")
The Webb Space Telescope is 100x as powerful as the Hubble. It will change astronomy. - Vox
Astronauts release Hubble telescope back into space | Reuters.com
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NASA Hubble Repairman Grunsfeld Selected for U.S. Astronaut Hall of Fame | NASA
James Webb Space Telescope: how our launch of world's most complex observatory will rest on a nail-biting knife edge
A Journey through Time: Exploring the Universe with the Hubble Space Telescope: Barbree, Jay, Caidin, Martin, Glenn, John H.: 9780670860180: Amazon.com: Books
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Deep Space: New Pictures from the Hubble Space Telescope by John Gribbin: Fine Paperback (1999) | WorldofBooks
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The James Webb Space Telescope is fully deployed. So what's next for the biggest observatory off Earth? | Space
Hubble hugger' eager to fix telescope
In this NASA photo astronaut Andrew Feustel, mission specialist, performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week's work on the orbiting observatory,
