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Event Horizon Telescope
The EHT project combines data from several very-long-baseline interferometry VLBI stations around Earth with angular resolution sufficient to observe objects the size of a supermassive black hole 's event horizon. The Event Horizon Telescope project is an international collaboration launched in  after a long period of theoretical and technical developments. The first image of a black hole, at the center of galaxy Messier 87, was published by the EHT Collaboration on April 10, , in a series of six scientific publications. Future plans involve improving the array's resolution by adding new telescopes and by taking shorter-wavelength observations. The EHT is composed of many radio observatories or radio telescope facilities around the world, working together to produce a high-sensitivity, high-angular-resolution telescope. Through the technique of very-long-baseline interferometry VLBI , many independent radio antennas separated by hundreds or thousands of kilometres can act as a phased array , a virtual telescope which can be pointed electronically, with an effective aperture which is the diameter of the entire planet. Each year since its first data capture in , the EHT array has moved to add more observatories to its global network of radio telescopes. The Event Horizon Telescope Collaboration announced its first results in six simultaneous press conferences worldwide on April 10, The image provided a test for Albert Einstein 's general theory of relativity under extreme conditions.