The dome of the Gran Telescopio Canarias in Spain’s Canary Islands shines in the sun. The telescope will be the largest in the world when it is completed late next year. Astronomers from Spain, Mexico and the United States will gather in South Florida the week of June 26 to plan for the first observations with the telescope. The highlight of the weeklong “First Light Science with the GTC” conference will be a reception, to be attended by the Spanish ambassador to the United States, U.S. and Mexican officials and astronomers, Thursday evening at the Biltmore Hotel in Coral Gables.