“For observation within the solar system, Arecibo was able to transmit signals and receive their reflections from planets, a function that FAST isn’t able to complete on its own. The feature allowed Arecibo to facilitate monitoring of near-Earth asteroids, which is important in defending the Earth from space threats,” said Liu Boyang, a researcher in radio astronomy at the International Centre for Radio Astronomy Research, University of Western Australia.
“For observation within the solar system, Arecibo was able to transmit signals and receive their reflections from planets, a function that FAST isn’t able to complete on its own. The feature allowed Arecibo to facilitate monitoring of near-Earth asteroids, which is important in defending the Earth from space threats,” said Liu Boyang, a researcher in radio astronomy at the International Centre for Radio Astronomy Research, University of Western Australia.
ref - South CHINA Morning Post: https://www.scmp.com/tech/science-research/article/3112416/chinas-fast-worlds-only-giant-single-dish-radio-telescope