![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
![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 in La Palma, Canary Islands, Spain Editorial Photography - Image of canary, astronomy: 192439092 Gran Telescopio in La Palma, Canary Islands, Spain Editorial Photography - Image of canary, astronomy: 192439092](https://thumbs.dreamstime.com/z/gran-telescopio-la-palma-canary-islands-spain-roque-de-los-muchachos-observatory-located-highest-mountain-192439092.jpg)
Gran Telescopio in La Palma, Canary Islands, Spain Editorial Photography - Image of canary, astronomy: 192439092
![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)