I have no idea and it does not even say it in the textbook
Keck telescopes do not exist, Keck telescope refers to the WM Keck Observatory on Mt. Kea.The Keck Observatory is comprised of several opticalreflecting telescopes, whereas aradio telescope consists of a large parabolic solid metal or screen reflector with a radioreceiver at its focus, built to detect and measure radio waves.
keck telescopes 1,2 tie the records for the largest telscopes in the world
keck telescopes 1,2 tie the records for the largest telscopes in the world
The Keck Observatory is located near the summit of Mauna Kea on the Big Island of Hawaii. It consists of two telescopes, Keck I and Keck II, which are among the largest and most scientifically productive telescopes in the world.
The largest telescope in Hawaii is called the Keck Observatory. It is located on Mauna Kea and consists of two 10-meter telescopes that are among the biggest optical/infrared telescopes in the world.
Some examples of optical telescopes include the Hubble Space Telescope, the Keck Observatory telescopes, and the Very Large Telescope (VLT) in Chile. These telescopes use lenses or mirrors to gather and focus visible light from distant celestial objects for observation.
Keck Telescope on Mauna Kea in Hawaii
This best answer describes a reflecting telescope. The maximum size for a refractor on Earth is about 40 inches due to gravitational sag. Palomar's primary mirror is some 16 feet in diameter, and the Keck telescopes use several large mirrors that are computer-controlled and act as a single disk twice the size of Palomar.
1977
10 m
The telescopes' primary mirrors are 10 meters in diameter.