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.

Question

Quizplus · Accepted Answer

X-rays do not penetrate Earth's atmosphere, so X-ray telescopes need to be placed in space to observe X-ray emissions from astronomical objects. X-rays don't penetrate Earth's atmosphere, so any X-ray telescope on Earth would not be able to gather data from astronomical objects outside of Earth's atmosphere. Therefore, X-ray telescopes must be placed in space.

There Are No X-Ray Telescopes on Earth Because