Since the SETI program began in 1959, scientists have been scanning the sky for signals sent by another,alien civilization.To do this,they use the world's largest radio telescope which is located in arecibo, Puerto Rico. The Arecibo telescope is 1,000 feet(305 meters) in diameter. This telescope is so large,it is said that it could hold 10 billion bowls of cornflakes! The telescope collects and send data to SETI computers 24 hours a day.