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Optical and radiotelescopes are built on...

Optical and radiotelescopes are built on the ground but X - ray astronomy is possible only from satellites orbiting the earth. Why ?

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Because, Earth.s atmosphere is transparent to radio waves and visible light. But X - rays get absorbed by Earth.s atmosphere. Hence we take the help of ..Geo - stationary satellite.., orbitting around the Earth, approximately at the height 36000 km, for the study of ..X - ray astronomy... At this great height atmosphere is quite thin and so X - rays are not absorbed.
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