Clouds fly over the Gran Telescopio de Canarias (R), or GTC , the world's largest telescope, at the observatory on the island of La Palma, in Spain's Canary Islands July 24, 2009. The GTC tops the 10m (32.8 foot) Keck Telescopes on Hawaii's Mauna Kea and investigators will use it to look into matters such as how the universe was formed and what it contains. The telescope was developed by Spain, Mexico and the University of Florida. REUTERS/Santiago Ferrero (SPAIN ENVIRONMENT SOCIETY SCI TECH)
REUTERS/SANTIAGO FERRERO