![Sharon Backhouse on Twitter: "The world's largest telescope has been closed for 22 days (Gran Telescopio Canarias (GTC): “the ash from the La Palma volcano is "like blades" that could damage the Sharon Backhouse on Twitter: "The world's largest telescope has been closed for 22 days (Gran Telescopio Canarias (GTC): “the ash from the La Palma volcano is "like blades" that could damage the](https://pbs.twimg.com/media/FBzbC6ZWQAM3O-_.jpg)
Sharon Backhouse on Twitter: "The world's largest telescope has been closed for 22 days (Gran Telescopio Canarias (GTC): “the ash from the La Palma volcano is "like blades" that could damage the
![Gran Telescopio Canarias, Astronomical Telescope at Roque de los Muchachos Observatory, La Palma Island, Canaries, Spain Stock Photo - Alamy Gran Telescopio Canarias, Astronomical Telescope at Roque de los Muchachos Observatory, La Palma Island, Canaries, Spain Stock Photo - Alamy](https://c8.alamy.com/comp/W2DP19/gran-telescopio-canarias-astronomical-telescope-at-roque-de-los-muchachos-observatory-la-palma-island-canaries-spain-W2DP19.jpg)
Gran Telescopio Canarias, Astronomical Telescope at Roque de los Muchachos Observatory, La Palma Island, Canaries, Spain Stock Photo - Alamy
![Largest optical reflecting telescope Gran Telescopio Canarias located on grassy hilltop against cloudy sky at astronomical Largest optical reflecting telescope Gran Telescopio Canarias located on grassy hilltop against cloudy sky at astronomical](https://www.westend61.de/images/0001499286pw/largest-optical-reflecting-telescope-gran-telescopio-canarias-located-on-grassy-hilltop-against-cloudy-sky-at-astronomical-observatory-on-island-of-la-palma-in-spain-ADSF19683.jpg)
Largest optical reflecting telescope Gran Telescopio Canarias located on grassy hilltop against cloudy sky at astronomical
![The Gran Telescopio Canarias - GranTeCan or GTC, also known as the Great Canary Telescope. La Palma, Canary Islands, Spain Stock Photo - Alamy The Gran Telescopio Canarias - GranTeCan or GTC, also known as the Great Canary Telescope. La Palma, Canary Islands, Spain Stock Photo - Alamy](https://c8.alamy.com/comp/FWRJPH/the-gran-telescopio-canarias-grantecan-or-gtc-also-known-as-the-great-FWRJPH.jpg)
The Gran Telescopio Canarias - GranTeCan or GTC, also known as the Great Canary Telescope. La Palma, Canary Islands, Spain Stock Photo - Alamy
![The Gran Telescopio CANARIAS GTC, Roque de los Muchachos Observatory, La Palma, Canary Islands, Spain The Gran Telescopio Stock Photo - Alamy The Gran Telescopio CANARIAS GTC, Roque de los Muchachos Observatory, La Palma, Canary Islands, Spain The Gran Telescopio Stock Photo - Alamy](https://c8.alamy.com/comp/DF254D/the-gran-telescopio-canarias-gtc-roque-de-los-muchachos-observatory-DF254D.jpg)
The Gran Telescopio CANARIAS GTC, Roque de los Muchachos Observatory, La Palma, Canary Islands, Spain The Gran Telescopio Stock Photo - Alamy
![The Gran Telescopio Canarias discovers the largest cluster of galaxies known in the early universe | Instituto de Astrofísica de Canarias • IAC The Gran Telescopio Canarias discovers the largest cluster of galaxies known in the early universe | Instituto de Astrofísica de Canarias • IAC](https://www.iac.es/sites/default/files/images/inline-images/GTC%20puesta%201.jpg)