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Author Question: There are no X-ray telescopes on Earth because A) they are too expensive to buil (Read 600 times)

futuristic

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on: Aug 27, 2013
There are no X-ray telescopes on Earth because
A) they are too expensive to build      
B) no one has yet invented an X-ray telescope that works
C) we can't figure out how to direct an X-ray beam through space
D) X-rays don't penetrate Earth's atmosphere
E) there are no astronomical objects that emit X-rays


curlz

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Reply #1 on: Aug 28, 2013
D


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