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It doesn't have to be big telescopes, there does not even have to be a telescope. It is called an observatory because it is a place where astronomical observations are made. Long before the first telescope was made there were observatories.
None of them. The first telescopes were developed in 1608 by three Dutch opticians. You may have been thinking of Galileo, who built his telescope based on their descriptions, and who may have been the first person to use a telescope to observe the stars. His observations of Jupiter the following year did revolutionize astronomy.
No, Galileo did not invent the telescope. According to Wikipedia "The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey" Galileo was the first person to turn the telescopes to the night sky and make some pretty contradictory observations.
hubble
The first telescopes actually came from China. Galileo of Italy perfected a telescope in the 1600's.
angela merkel
Telescopes are instruments used by astronomers. The first person to do this was Galileo.
Around 1608.
Angela Merkel
Celestron telescopes may be bought at the official website of Celestron. They describe the process in how to buy one's first telescope on this website and have a wide range of telescopes to select from.
the 17th century
in 1609 Galileo made first telescopes