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Chandra is an Earth satellite in a 64-hour orbit, and its mission is ongoing as of 2025. Chandra is one of the Great Observatories, along with the Hubble Space Telescope, Compton Gamma Ray Observatory (1991–2000), and the Spitzer Space Telescope (2003–2020).
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In the meantime, in 1978, NASA launched the first imaging X-ray telescope, Einstein Observatory (HEAO-2), into orbit. Work continued on the Chandra project through the 1980s and 1990s. In 1992, to reduce costs, the spacecraft was redesigned. Four of the twelve planned mirrors were eliminated, as were two of the six scientific instruments.
The High Altitude Gamma Ray Telescope (HAGAR) is an atmospheric Cerenkov experiment with 7 telescopes set up at Hanle in 2008. [18] Each telescope has 7 mirrors with a total area of 4.4 square metres (47 sq ft). The telescopes are deployed on the periphery of a circle of radius 50 metres (160 ft) with one telescope at the center.
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The Chandra X-ray Observatory is the third of NASA's four Great Observatories. Chandra X-ray Observatory The main article for this category is Chandra X-ray Observatory .
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The primary objective of the STS-93 mission was to deploy the Chandra X-ray Observatory (formerly the Advanced X-ray Astrophysics Facility) with its Inertial Upper Stage booster. At its launch, Chandra was the most sophisticated X-ray observatory ever built. It is designed to observe X-rays from high energy regions of the universe, such as hot ...