Multiple choice general knowledge

Xray astronomy is

  1. the study of x ray of planets !!!

  2. the study of x rays of pictures of planets

  3. study of x rays emitted by celestial bodies

  4. study of human x rays taken when in space
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

X-ray astronomy is the study of X-rays emitted by celestial bodies including stars, galaxies, black holes, and neutron stars. These high-energy X-rays are absorbed by Earth's atmosphere, so X-ray telescopes must be placed in space. It is not the study of X-rays of planets themselves or human X-rays in space.

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