In September, China flicked the switch on the world's largest radio telescope. The unusually large dish in an isolated area of Guizhou province needs radio silence to hone in on potential signs of alien life and distant pulsars, but researchers fear that a huge influx of tourists could be rendering the ┬ąCN1.2 billion ($228 million) dish useless. Now, a choice between a booming local economy and the advancement of science looms on the horizon.