What is the nickname of the world's largest radio telescope, built in China?

Correct option is D

The correct answer is (d) Tianyan
Explanation:
. The Five-hundred-meter Aperture Spherical radio Telescope (FAST), located in Guizhou, China, is the world's largest filled-aperture radio telescope.
. It is popularly nicknamed "Tianyan," which translates to "Heaven's Eye" or "The Eye of Heaven."
. Completed in 2016, it consists of a fixed primary dish made of 4,450 triangular panels.
. Its primary mission is to detect pulsars, interstellar molecules, and search for potential extraterrestrial intelligence.
. It is significantly more sensitive than the now-collapsed Arecibo Observatory in Puerto Rico, which was the previous record holder.
Information Booster:
. The telescope is built in a natural karst depression (a sinkhole) which provides a natural support structure and helps shield it from radio frequency interference.
. Radio telescopes like FAST "listen" to radio waves from space, unlike optical telescopes that "see" visible light.
Additional Knowledge:
KAT-7 (Option b)
. A seven-dish radio telescope array located in the Northern Cape of South Africa, serving as a precursor to the MeerKAT array.
Delia (Option c)
. Not a recognized name for a major global radio telescope.
Nanshan (Option d)
. Refers to the Nanshan 25m Radio Telescope, also located in China (Urumqi), but it is much smaller than the FAST (Tianyan) telescope.