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Cassiopeia A, Then the Cosmos: 25 Years of Chandra X-ray Science
NASA’s Chandra X-ray Observatory opened its powerful telescopic eye in orbit for the first time on Aug. 26, 1999. Over the next 25 years, Chandra has delivered nearly 25,000 observations of black holes, galaxy clusters, and other high-energy cosmic phenomena. And Chandra isn’t done yet.
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