Following the collapse of the historic Arecibo Observatory in Puerto Rico, China has opened the biggest radio telescope in the world up to international scientists. In Pingtang, Guizhou province stands the Five-hundred-meter Aperture Spherical Telescope (FAST), the largest radio telescope in the world, surpassing the Arecibo Observatory, which stood as the largest in the world for 53 years before the construction of FAST was completed in 2016. Following two cable failures earlier this year, Arecibo’s radio telescope collapsed in November, shutting down the observatory for good. Now, FAST is opening its doors to astronomers from around the world.