HOUSTON — NASA’s Chandra X-ray Observatory, launched 15 years ago this week, appears fit for another decade or more of observations, characterizing black holes and other high-energy cosmic phenomena from its elliptical orbit around the Earth. Tucked in the payload bay of the shuttle Columbia, Chandra arrived in space on July 23, 1999. Columbia’s five astronauts deployed the 45-ft.-long observatory and its twin solid-rocket boosters within 9 hr. Subsequent burns of the SRBs ...


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