The Gran Telescopio Canarias, or GTC, or GRANTECAN, is the biggest telescope at the observatory on La Palma. Video journalist Brady Haran has a look inside. With extra commentary by proper astronomer Professor Mike Merrifield, from the University of Nottingham. GTC website (English): http://www.gtc.iac.es/en/pages/gtc.php?lang=EN IAC website: http://www.iac.es/ Deep Sky Videos website: http://www.deepskyvideos.com/ Twitter: https://twitter.com/#!/DeepSkyVideos Facebook: http://www.facebook.com/DeepSkyVideos Flickr: http://www.flickr.com/photos/68847473@N02/ More about the astronomers in our videos: http://www.deepskyvideos.com/pages/contributors.html Videos by Brady Haran