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Chandra X-ray Observatory

United Nations has declared the year 2015 as the International Year of  Light. Chandra X-ray Observatory was launched by NASA on July 23, 1999 to study the stars and galaxies in the universe. It was previously known as Advanced X-ray Astrophysics facility but later changed in honor of Subrahmanyan Chandrasekhar. It was 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.
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Chandra X-ray Observatory study the X-ray sources coming from far away galaxy which do not enter the Earth atmosphere. By using the X-rays images from the Chandra observatory, scientists understand the structure and evolution of the universe.
X-ray telescope uses a Wolter telescope consisting of nested cylindrical paraboloid and hyperboloid surfaces coated with gold and iridium, as X-rays would be absorbed by normal mirrors. Chandra is one of the farthest satellite in the Earth orbit.
Chandra data has greatly advanced the astronomy. The image of the Cassiopeia gave astronomers the glimpse of the compact object at the center of  the remnant, probably neutron star or black hole.
On January 5, 2015 ,  CXO has observed an X-ray flare 400 times brighter than usual, from a supermassive black hole, Sagittarius A which is in the center of our MilkyWay.

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