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《2023 Future Science Trends》 See more https://bit.ly/3J3T0Q0 Black holes are the most mysterious celestial bodies in this universe. The strong gravity of a black hole warps space-time infinitely. If caught in the gravity of a black hole and crosses the event horizon, no matter, not even light, can escape again. We humans may never know what lies beyond this event horizon. All matter heading to the singularity beyond the event horizon can never escape again, so no information can be sent out of the black hole. On April 10, 2019, the Event Horizon Telescope (EHT) succeeded in photographing a black hole for the first time in human history. In addition, on May 12, 2022, approximately three years after the world's first photograph of a black hole, the EHT also succeeded in photographing the black hole located at the center of our galaxy. How on earth did humans observe a black hole?