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No other reason but to protect the materials of which it's constructed from weather damage and deterioration. Unlike optical telescopes, few radio telescopes are situated inside structures that protect them from the elements, mainly because of their size.
Researchers use all of these: -- optical telescopes -- radio telescopes -- x-ray telescopes -- infra-red telescopes -- ultraviolet telescopes
telescopes to study the night sky and take detailed observations of celestial objects such as planets, stars, and galaxies. These observatories are situated at high elevations on Mauna Kea in Hawaii to minimize atmospheric interference and provide clearer views of space.
refracting
No they are not bigger then radio telescopes at all.
Radio telescopes collect radio waves. Optical telescopes capture visible light waves.
Ground-based telescopes, and space telescopes. Or: refracting telescopes (main collector is a lens), and reflecting telescopes (main collector is a mirror). Or: Home telescopes (small ones), and professional ones (larger and more expensive).
At a store for telescopes!
All space telescopes are unmanned - unless you want to count the small telescopes on the Shuttle or IIS as space telescopes.
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they the same
Reflecting telescopes use mirrors to collect and focus light, while refracting telescopes use lenses. Reflecting telescopes typically have a closed tube design which protects the mirrors from dust and other contaminants, while refracting telescopes are more prone to chromatic aberration. Reflecting telescopes are generally easier to manufacture at larger sizes compared to refracting telescopes.