The Chandra X-Ray Observatory is a NASA telescope that looks at black holes, quasars, supernovas, and the like – all sources of high energy in the universe.

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NASA's Chandra X-ray Observatory is a telescope specially designed to detect X-ray emission from very hot regions of the Universe such as exploded stars, clusters of galaxies, and matter around black holes.

Because X-rays are absorbed by Earth's atmosphere, Chandra must orbit above it, up to an altitude of 139,000 km (86,500 mi) in space. It has been able to detect X-ray sources 20 times fainter than anything previously picked up by an x-ray telescope and can be used to study objects that emit X-rays, such as black holes , supernovae and dark matter . Chandra's probe of dark energy relies on the unique ability of X-ray observations to study the hot gas in galaxy clusters. By using Chandra data to figure out the ratio of hot gas to dark matter, astronomers determined how far away the clusters were and at what point in time they were viewing them. This year marks the 20th anniversary of two landmark missions: the Chandra X-ray Observatory, one of NASA's Great Observatories, which launched July 23, 1999, and the European Space Agency's X-ray Multi-Mirror mission (XMM-Newton), which launched a few months later on December 10th. Because X-rays are absorbed by Earth's atmosphere, Chandra must orbit above it, up to an altitude of 139,000 km (86,500 mi, apogee) in space. Chandra is positioned 200 times higher than the Hubble Space Telescope, in an elliptical, or oval-shaped, orbit.

Because X-rays are absorbed by Earth's atmosphere, Chandra must orbit above it, up to an altitude of 139,000 km (86,500 mi) in space. Get the latest updates on NASA missions, watch NASA TV live, and learn about our quest to reveal the unknown and benefit all humankind. NASA's Chandra X-ray Observatory is a telescope specially designed to detect X-ray emission from very hot regions of the Universe such as exploded stars, clusters of galaxies, and matter around black holes.

NASA's Chandra X-ray Observatory is a telescope specially designed to detect X-ray emission from very hot regions of the Universe such as exploded stars, clusters of galaxies, and matter around black holes. NASA's Chandra X-ray Observatory, which observes the hot and energetic universe, marks a big milestone today (July 23): 15 years in Earth orbit.

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