Gran Telescopio Canarias (GRANTECAN or GTC), a 10m optical Telescope at the Roque de los Muchachos Observatory, La Palma, Canary Islands. This image was stitched from two overlapping shots using <a href="https://en.wikipedia.org/wiki/PTgui" class="extiw" title="en:PTgui">PTgui</a>.
H. Raab (<a href="//commons.wikimedia.org/wiki/User:Vesta" title="User:Vesta">User:Vesta</a>)
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>