Observatory.
observatories
Observatory
well, it would usually be an observatory.....
reflecting telescopes
In the sentence "At the top of the building is an observatory that has telescopes for viewing the surrounding area", the only linking verb is "is".
Observatory
I believe the name of the first telescope was called the "telescope." The word was created from the Greek tele = 'far' and skopein = 'to look or see'; teleskopos = 'far-seeing'.
nope they are the same
There are many places where one can purchase spotting telescopes. Spotting telescopes can be purchased from most retailers that specialize in telescope products. One may also use online retailers such as Amazon to purchase these telescopes.
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, "telescopes" is not a collective noun; it is a plural noun that refers to multiple individual telescopes. A collective noun represents a group of individuals or things as a single entity, such as "team" or "flock." In contrast, "telescopes" simply denotes more than one telescope without implying a single unit.
Interferometry. First used in radio telescopes optical instruments were a "relatively" recent addition to the process. It is the interference of signals that is used to create resolution. The further the instruments are apart the better it works.