If we didn't have them we could not see as far and we would be quite far behind on our discoveries in astronomy.
they are so useful because it helps things that are far appear more near than they truly are.
To get a better view of object at extreme distances, also to see very tiny objects
because when you look through a telescope a planet or star suddenly appears much bigger and brighter, and also you can see a whole lot more stars that you didn't know were there.
They can detect cool Hydrogen gas
All of the observational tools needed by astronomers: astrolabes, quadrant, clocks, sextants, octant, spectrographs, polarimeters, telescopes, optical mount, radio telescopes, space telescopes, etc. are products of various technologies.
no, reflecting telescopes.
No
reflecting telescopes have concave lenses and refraccting telescopes have convex lenses.
Light is found by reflecting telescopes and refracting telescopes are used to dected sound
All of the observational tools needed by astronomers: astrolabes, quadrant, clocks, sextants, octant, spectrographs, polarimeters, telescopes, optical mount, radio telescopes, space telescopes, etc. are products of various technologies.
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