Why are telescopes like JWST orbiting Earth able to perform so much better than telescopes on Earth that aren’t restricted by their size?
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Atmosphere.
Telescope on Earth have to look thru all the junk in the air before reaching out into space. This can distorted the image and reduce the effectiveness of the telescope. That is why most of the Earth telescopes are on top of mountains to reduce the about if atmosphere and light pollution they have to deal with.
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