Massive telescope's 30-ton 'retina' undergoes final test

Key component put through its paces in dry run; FAST to become world's largest eye for scanning cosmos

Scientists carried out the last step in testing a key component of China's gigantic radio telescope on Saturday. After its scheduled completion in September, it will be the largest such telescope in the world.

A team successfully tested the installation of the telescope's "retina", a mechanism weighing 30 metric tons and suspended 140-160 meters above the half-finished reflector dish which will collect signals from the universe.