Why do some mountain summits have observatories and telescopes?
Quick Answer
High, dry mountain sites have thinner atmosphere, less water vapor, and often steadier air, which helps telescopes see farther and clearer. That is why many major observatories are built above much of the weather.
The Full Story
Astronomers want to reduce atmospheric blur, absorption, and moisture. At high altitude, there is less air above the telescope, so stars appear sharper and faint light is less distorted. Dry mountain air also contains less water vapor, which blocks some infrared and other wavelengths. Famous observatories are located on mountains such as Mauna Kea in Hawaii and in the Chilean Andes. These sites give some of the best ground-based views of the universe.
Key Facts
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