Previous record holder was the well-known Arecibo telescope at 305m diameter: https://en.wikipedia.org/wiki/Arecibo_Observatory https://en.wikipedia.org/wiki/A

Previous record holder was the well-known Arecibo telescope at 305m diameter: https://en.wikipedia.org/wiki/Arecibo_Observatory https://en.wikipedia.org/wiki/Arecibo_Observatory 500m may not seem like a huge improvement over that but here's a picture that puts it in perspective: https://en.wikipedia.org/wiki/Five-hundred-meter_Aperture_Spherical_Telescope#/media/File:Comparison_FAST_Arecibo_Observatory_profiles.svg https://en.wikipedia.org/wiki/Five-hundred-meter_Aperture_Sp...