Six years later, the world's largest telescope FAST will look up at the stars in China, so that China will continue to maintain the world's leading astronomical observation capabilities. At present, this domestic FAST telescope has completed five key technologies, and it was officially started construction at the end of this year. The total investment is expected to reach 688 million yuan.
Unlike other telescopes, FAST is neither on the top of the mountain nor in space, but is chosen to be a karst in Guizhou. This 500-meter spherical radio telescope is like a huge sky eye, made up of 2000 pieces of 15 meters square reflector. Its shape resembles a pan satellite dish, which is equivalent to 25 football fields. Compared with the world's largest fixed radio telescope with a diameter of 305 meters, the observable sky range is expanded by 4 times and the sensitivity is increased by 2.3 times. Even 110 The celestial radiant energy at the edge of the universe beyond the billion years of light can be seen.
Of course, the use of the FAST telescope is not just a visual inspection of the starry sky, it also reproduces images of the cosmic infancy. It turns out that the Encyclopedia of the Universe is written with a weak 21 cm of hydrogen. The highly sensitive FAST telescope can read this neutral hydrogen code and finally find the first generation of celestial bodies born at the beginning of the Big Bang.
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