[Voiceover] China has seen major breakthroughs in deep space exploration thanks to advanced radio telescopes, which some say are humanity's "eyes" for observing the universe. Since its launch in 2016, China's Five-hundred-meter Aperture Spherical Radio Telescope, or FAST, has identified more than 1000 new pulsars. The telescope was opened to the world in 2021. Over the years, more radio telescopes have joined international collaborations to deepen humanity's understanding of black hole observations. One of those is the Tianma Radio Telescope, a 65-meter aperture radio telescope in Shanghai. In 2019, a network of international radio telescopes created the first known image of a black hole. And while the Tianma was not directly involved in that observation, it did contribute to the calibration of the final data used for the image. [Soundbite] Shen Zhiqiang, radio astrophysics expert, Shanghai Astronomical Observatory: "What we see here are three images of the supermassive black hole at the center of the M87 galaxy - the subject of the first black hole photograph - taken in different years. The shape and size of these images remained unchanged over the four-year period. This confirms Einstein's theory of general relativity. However, the primary focus of this latest release is the white stripes superimposed on these black hole images. It is evident that in 2017 and 2018, the magnetic field directions of these white lines remained largely consistent. But in 2021, a fundamental reversal occurred - one that caught us off guard. This unexpected fundamental reversal indicates that the physical environment surrounding the black hole is undergoing continuous change." [Voiceover] Over the years, the Tianma has also attracted science enthusiasts for tourism experiences. The village that houses the telescope hosts educational camps and has several lodging and dining options for visitors. [Restrictions: No access Chinese mainland]