Discover what it took to build the largest and most sophisticated radio telescope on the planet. This engineering colossus will help astronomers explore galaxies billions of light years away, and might help discover extraterrestrial life. 　　译文(3): 探索建造地球上最大、最先进的射电望远镜的过程。这个工程巨人将帮助天文学家探索数十亿光年外的星系，并可能帮助发现地外生命。