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To perform the observation, the astronomers battled bad weather and glitchy electric grids. They donned oxygen tanks and climbed three-mile-high mountains to escape the interference of Earth’s atmosphere. Then they spent the two years parsing literal truckloads of data, some of which had to be shipped on hard drives from the South Pole and defrosted outside a supercomputer facility at MIT. Finally, they tested their findings against the results of a million simulations of what a black hole might look like, until at last they spotted a match.