reflectors
8.2 meter-miles
reflectors
The largest optical telescope in the world today is the Gran Telescopio Canarias (Grand Canary Telescope) in Spain, with an effective diameter of 10.4 meters. The world's largest individual radio telescope is the RATAN-600 in Russia, with the effective diameter of a 600 meter dish.
The Keck Observatory in Hawaii is a 10 meter optical telescope. Even larger is the Great Canary Telescope off the coast of Africa (west of Morocco) at 10.4 meters. EU scientists have requested permission to build a 40 meter optical telescope. The largest single radiotelescope dish is Arecibo.
Mirrors, The Hubble space telescope first had one big shaped mirror, which made the images blury so they sent up astronaughts and replaced it with 4 8.2 meter flat mirrors making the pictures more clear!
There are two very similar 10-meter telescopes at the W.M. Keck Observatory on Mauna Kea, on the Big Island of Hawaii.
No, the Hubble Space Telescope is not the biggest telescope ever built. While it is one of the most powerful and well-known space telescopes, it has a 2.4-meter (7.9-foot) primary mirror. The largest optical telescope currently is the Gran Telescopio Canarias, which has a mirror measuring 10.4 meters (34 feet) in diameter. Additionally, the future Extremely Large Telescope is expected to have a mirror larger than 39 meters (128 feet).
Arecibo
The light gathering power is directly proportional to the light gathering area, so all you have to do is figure out the ratio of the areas of the two scopes. Another answer: Do you remember fourth grade arithmetic? Do you remember pi r square?
The ratio of the area is (60 / 10) squared, or 36.
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The largest reflecting telescope in Asia is located at the National Astronomical Observatory of Japan in Okayama Prefecture. It is known as the Subaru Telescope and has a primary mirror that measures 8.2 meters (27 feet) in diameter.