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# Optical and radio telescopes are built on the ground but x- ray astronomy is possible only from satellite orbiting the earth . why ?

$\begin{array}{1 1} \text{x-rays are of very short , wave length } \\ \text{x-rays are of very long , wave length } \\ \text{x-rays are of very high frequencies} \\ \text{x-rays are absorbed by the atmosphere} \end{array}$