<P> The Chandra X-ray Observatory ( CXO ) , previously known as the Advanced X-ray Astrophysics Facility ( AXAF ) , is a Flagship - class space observatory launched on STS - 93 by NASA on July 23 , 1999 . Chandra is sensitive to X-ray sources 100 times fainter than any previous X-ray telescope , enabled by the high angular resolution of its mirrors . Since the Earth 's atmosphere absorbs the vast majority of X-rays , they are not detectable from Earth - based telescopes ; therefore space - based telescopes are required to make these observations . Chandra is an Earth satellite in a 64 - hour orbit , and its mission is ongoing as of 2018 . </P>
<P> The Chandra X-ray Observatory ( CXO ) , previously known as the Advanced X-ray Astrophysics Facility ( AXAF ) , is a Flagship - class space observatory launched on STS - 93 by NASA on July 23 , 1999 . Chandra is sensitive to X-ray sources 100 times fainter than any previous X-ray telescope , enabled by the high angular resolution of its mirrors . Since the Earth 's atmosphere absorbs the vast majority of X-rays , they are not detectable from Earth - based telescopes ; therefore space - based telescopes are required to make these observations . Chandra is an Earth satellite in a 64 - hour orbit , and its mission is ongoing as of 2018 . </P>
where is the chandra x ray telescope located
where is the chandra x ray telescope located
Earth satellite in a 64 - hour orbit
Earth satellite in a 64 - hour orbit