there are more scientists in UK compared to the other countries.
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ISTAR Optical in the UK offers telescopes for general star viewing and specifically for "comet hunting", mounting and other accessories for the telescopes, objective lenses, and astrographs.
Researchers use all of these: -- optical telescopes -- radio telescopes -- x-ray telescopes -- infra-red telescopes -- ultraviolet telescopes
refracting
no, reflecting telescopes.
No they are not bigger then radio telescopes at all.
Argos has a range of six telescopes - ranging in price from £10 to £180. See related link for more information.
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).
No
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.