it ranges depending on the telescope...
how long was the first radio telescope
300 feet long.
The telescope has been used for over 100 years!!!
Galileo's telescope was about 92.7 centimeters long. 36.5 inches long.
43.5 feet long
It was 300 feet long
Aristotle did not invent the telescope; he lived roughly 2000 years before the telescope was invented.
No. The light that enters the front of the telescope is light that left the sun 8 minutes earlier.If the telescope is 100 ft long, then it takes the light about 0.0000000001 second to travel from thefront end of the telescope to the back end, which is about how long it takes for you to go blind if youlook through the telescope directly at the sun.
Galileo created his first telescope in around two months in 1609. It was a refracting telescope with a convex objective lens and a concave eyepiece. This instrument revolutionized astronomy and allowed Galileo to make groundbreaking astronomical observations.
Yes. Mars has been known since ancient times, long before the telescope was invented.
43.5 feet long
I think if you look into a telescope or stargaze for a long time you will.