Undated file photo shows a night view of the Armazones hill in the Atacama desert, about 130 km (80 miles) south of the northern Antofagasta city, where the world's largest telescope will be built by the European Southern Observatory (ESO). The world's largest telescope will be built in Chile's northern desert at a cost over $1 billion, the ESO said on April 26, 2010 and will set its sights on discovering other worlds like our own.