Puerto Rico's Arecibo radio telescope seems likely to lose its status as the world's largest. As part of an international initiative to build a massive radio telescope array, China has recently broken ground on its Five-hundred-meter Aperture Spherical radio Telescope (FAST). Not only will it be physically larger, but its design will incorporate new technologies to enable it to be more precise and efficient. They're even planning on letting SETI spend some time with it.