Black holes are among the strangest and most fascinating objects in the universe. They're so dense and have such a strong gravitational pull that even light cannot escape their grasp if it gets close enough. With his general theory of relativity, Albert Einstein predicted the existence of black holes for the first time in 1916. Many years later, in 1967, American astronomer John Wheeler coined the term "black hole." After decades of only knowing black holes as theoretical objects, the first physical black hole was discovered in 1971.The Event Horizon Telescope (EHT) collaboration then released the first image of a black hole in 2019. The EHT discovered the black hole in the centre of galaxy M87 while studying the event horizon, or the region beyond which nothing can escape from a black hole. The image depicts the abrupt loss of photons (particles of light). Now that astronomers know what a black hole looks like, it opens up a whole new area of research in black holes.
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