The world's largest radio telescope is up and running in China.

FOX's Carmen Roberts reports:

Move over Puerto Rico, your Arecibo Observatory is no longer the world's biggest dish. China's 500-meter radio telescope is now searching the stars for extraterrestrial life and answers to how the universe began.

The telescope dubbed "fast" is China's latest addition to its growing scientific space program, taking five years to build at a cost of $180 million.

China's official news agency, Xinhua, says FAST is twice as sensitive as Arecibo and up to 10 times as quick. If so, that gives FAST a greater chance of finding ET.

Carmen Roberts, FOX News.