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Do you mean the Chandra X-ray observatory? Chandra does not operate in the gamma ray wavelengths, it typically can observe light in the "soft" X-ray wavelengths (from about 10 to .10 nm). Gamma rays generally have wavelengths of .001 nm or smaller.

Earth's atmosphere actually absorbs most X-rays, so in order to see at that wavelength, a space telescope was needed. Also, X-rays and gamma rays are so energetic that they cannot be gathered by normal means such as a curved optical mirror used in most "optical" telescopes (for visible wavelengths and even some infrared/ultraviolet imaging). X-ray light will pass right through these kinds of mirrors. Chandra uses a series of concentric parabolic mirrors that slightly deflect the paths of x-ray photons towards a detector.

Here are some images to compare optical mirrors to Chandra's mirrors.

wisconsinastronomy.org/images/scopes/NewtCut_m.jpg

spie.org/Images/Graphics/Newsroom/Imported/11_243_0_2006-01-17/11_fig2.jpg

Hope this helps.

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