![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
![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
![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
![Telescope Grantecan Stock Photo - Download Image Now - Gran Telescopio Canarias, Roque de los Muchachos Observatory, Astronomy - iStock Telescope Grantecan Stock Photo - Download Image Now - Gran Telescopio Canarias, Roque de los Muchachos Observatory, Astronomy - iStock](https://media.istockphoto.com/id/1052048406/photo/telescope-grantecan.jpg?s=612x612&w=0&k=20&c=oiA6cwjJf8OdXoUwXfZJoriAdRRSejOqMGJ0aemI_DU=)