Why did the "Sky Eye" FAST telescope choose to be located in Guizhou, which is now rainy?

Before selecting Dabaokeng in Jinke Village, Kaidao Town, Pingtang, Guizhou, after nearly ten years of repeated research and demonstration, scientists selected this optimal geographical location as the ideal location for building a "Super Tianan". " place. The main considerations in choosing this place to build the Fast project are as follows: The geological structure of the construction site must ensure the continued safe operation of the radio telescope. Guizhou's karst terrain has underground caves and underground rivers, which ensures that there will be no accumulation of water on the surface, which contributes to the continued safe work of the Sky Eye. This is also an important factor in choosing Guizhou to build Chutianan. Infrastructure costs are minimal. The Dachao area in Pingtang, Guizhou has a natural concave shape, the terrain is closest to the shape of FAST, the amount of engineering excavation is the smallest, and the construction cost is the lowest.

The electromagnetic interference to the FAST project is small. Radio telescopes need to observe electromagnetic wave signals from the universe, so they need a relatively quiet place where they can carefully listen to the "voice" of the universe. There are no towns within a 5-kilometer radius of the "Big Nest", and the surrounding mountains are towering, which can effectively block it. Man-made electromagnetic interference, the entire wireless environment is very superior. The overall altitude of Chongqing is lower than that of Guizhou, and the weather is the main reason why Tianan did not build Chongqing. The clouds in Chongqing are too thick from December to March, and all Chongqing is basically cloudy during this period. It is foggy in April, June, and November, and the sunshine is too severe in July, September, and October. The high temperature lasts for a long time, and the temperature difference between day and night is small. . If this thing is built until Chongqing summer, it will be a serious heat-absorbing killer. If you are basking in the sun, the temperature can rise to 100C in a day. Sprinkle grapes to become raisins.

This optical telescope in Earth orbit was diagnosed with "myopia" in the early days of takeoff, but it has made great contributions to the development of astronomy and cosmology in the 30 years since it was installed with a calibration device. Today, most of the images we see of nebulae and galaxies were taken with the Hubble Telescope.

From the initial naked-eye sky survey to the current automatic sky survey, the essence of astronomical observation is to collect as many photons as possible, so astronomy at that time should be called "visible light astronomy", but the optics installed in the earth's atmosphere Telescopes cannot completely eliminate atmospheric disturbances, so there have been no major breakthroughs in astronomy for a long time. Our country's sensitivity to Tianan and electromagnetic waves has reached the level of "listening to the moon for phone calls." Therefore, if there are intelligent electromagnetic signals in the universe, Tianan is the scientific equipment most likely to discover them.