11 questions
Why are many large optical telescopes located on mountains?
it is cheaper to build on mountains
to be above part of the atmosphere
because it is easier to build telescopes on mountains
to be closer to city lights
Why are x-ray telescopes placed above Earth's atmosphere?
to be closer to space
the atmosphere absorbs most cosmic radiation from space
they are too big to put on Earth
X ray telescopes are to dangerous to operate on Earth