Obviously there are many, but meade and celestron are leading manufacturers.
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.
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.
reflecting telescopes have concave lenses and refraccting telescopes have convex lenses.
Telescopes in general. Optical telescopes Radio telescopes Gravity wave telescopes
telescopes have found out that im AWESOME