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Telescopes from the Ground Up
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The paths of X-rays through the Chandra X-ray Observatory

X-rays are hard to observe. Because they have so much energy, X-rays aimed directly at a
conventional telescope mirror will penetrate it, instead of bouncing off. Chandra’s mirrors
have to be placed at just the right angle in order for X-rays to glance off their surfaces.

Diagram illustrating the optical design of the Chandra X-Ray telescope.
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