![James Webb Space Telescope: how our launch of world's most complex observatory will rest on a nail-biting knife edge James Webb Space Telescope: how our launch of world's most complex observatory will rest on a nail-biting knife edge](https://images.theconversation.com/files/438175/original/file-20211217-15-nhmkwp.jpeg?ixlib=rb-1.1.0&rect=0%2C0%2C2880%2C2845&q=20&auto=format&w=320&fit=clip&dpr=2&usm=12&cs=strip)
James Webb Space Telescope: how our launch of world's most complex observatory will rest on a nail-biting knife edge
![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 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](https://previews.agefotostock.com/previewimage/medibigoff/170a29bf99c0de4576f2903ee22924bf/s98-1161110.jpg)
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
![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 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](https://c8.alamy.com/comp/FK36TC/astronauts-john-grunsfeld-left-and-andrew-feustel-performs-repairs-FK36TC.jpg)
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
![Astronaut John Grunsfeld placing a NOBL on Bay 8 after he removed the... | Download Scientific Diagram Astronaut John Grunsfeld placing a NOBL on Bay 8 after he removed the... | Download Scientific Diagram](https://www.researchgate.net/profile/Bruce-Banks/publication/291254155/figure/fig1/AS:330951906349058@1455916491594/Astronaut-John-Grunsfeld-placing-a-NOBL-on-Bay-8-after-he-removed-the-damaged-Bay-8-MLI_Q640.jpg)
Astronaut John Grunsfeld placing a NOBL on Bay 8 after he removed the... | Download Scientific Diagram
![Hubble Vision: Astronomy with the Hubble Space Telescope: Petersen, Carolyn Collins, Brandt, John C.: 9780521496438: Amazon.com: Books Hubble Vision: Astronomy with the Hubble Space Telescope: Petersen, Carolyn Collins, Brandt, John C.: 9780521496438: Amazon.com: Books](https://images-na.ssl-images-amazon.com/images/I/41TMTNECDEL._SX367_BO1,204,203,200_.jpg)
Hubble Vision: Astronomy with the Hubble Space Telescope: Petersen, Carolyn Collins, Brandt, John C.: 9780521496438: Amazon.com: Books
![File:UGC 1810 and UGC 1813 in Arp 273 (captured by the Hubble Space Telescope).jpg - Wikimedia Commons File:UGC 1810 and UGC 1813 in Arp 273 (captured by the Hubble Space Telescope).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/1/14/UGC_1810_and_UGC_1813_in_Arp_273_%28captured_by_the_Hubble_Space_Telescope%29.jpg/2021px-UGC_1810_and_UGC_1813_in_Arp_273_%28captured_by_the_Hubble_Space_Telescope%29.jpg)
File:UGC 1810 and UGC 1813 in Arp 273 (captured by the Hubble Space Telescope).jpg - Wikimedia Commons
244 Space Shuttle Atlantis Continues Mission To Repair Hubble Space Telescope Photos and Premium High Res Pictures - Getty Images
![A Journey through Time: Exploring the Universe with the Hubble Space Telescope: Barbree, Jay, Caidin, Martin, Glenn, John H.: 9780670860180: Amazon.com: Books A Journey through Time: Exploring the Universe with the Hubble Space Telescope: Barbree, Jay, Caidin, Martin, Glenn, John H.: 9780670860180: Amazon.com: Books](https://images-na.ssl-images-amazon.com/images/I/71N9P6KM4EL._SX258_BO1,204,203,200_.gif)
A Journey through Time: Exploring the Universe with the Hubble Space Telescope: Barbree, Jay, Caidin, Martin, Glenn, John H.: 9780670860180: Amazon.com: Books
![Expanding Universe. The Hubble Space Telescope by John Mace Grunsfeld, Owen Edwards, Zoltan Levay, Jr., Charles F. Bolden (Hardcover, 2021) for sale online | eBay Expanding Universe. The Hubble Space Telescope by John Mace Grunsfeld, Owen Edwards, Zoltan Levay, Jr., Charles F. Bolden (Hardcover, 2021) for sale online | eBay](https://i.ebayimg.com/images/g/QrEAAOSwYJZhLh7f/s-l600.jpg)
Expanding Universe. The Hubble Space Telescope by John Mace Grunsfeld, Owen Edwards, Zoltan Levay, Jr., Charles F. Bolden (Hardcover, 2021) for sale online | eBay
![DVIDS - Images - John Grunsfeld and Richard Linnehan Repair the Hubble Space Telescope During STS-109 DVIDS - Images - John Grunsfeld and Richard Linnehan Repair the Hubble Space Telescope During STS-109](https://d1ldvf68ux039x.cloudfront.net/thumbs/photos/1302/832291/1000w_q95.jpg)
DVIDS - Images - John Grunsfeld and Richard Linnehan Repair the Hubble Space Telescope During STS-109
![Calaméo - Cosmos by John Hussey Daily Blog - Improved Hubble yardstick gives fresh evidence for new physics in the universe Calaméo - Cosmos by John Hussey Daily Blog - Improved Hubble yardstick gives fresh evidence for new physics in the universe](https://p.calameoassets.com/180514135755-3b996e0bff116b7e29cfc098593a76bb/p1.jpg)
Calaméo - Cosmos by John Hussey Daily Blog - Improved Hubble yardstick gives fresh evidence for new physics in the universe
![Deep Space: New Pictures from the Hubble Space Telescope by John Gribbin: Fine Paperback (1999) | WorldofBooks Deep Space: New Pictures from the Hubble Space Telescope by John Gribbin: Fine Paperback (1999) | WorldofBooks](https://pictures.abebooks.com/isbn/9780094796706-us.jpg)