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However, the observing period was not the first time FAST listened to the sky - it was scientifically operational for more than one year for testing and reviewing. On August 29, 2019, it became the first telescope to catch an extremely active episode of Fast Radio Burst (FRB) 121102, the first repeating FRB source ever discovered. The subsequent FAST observing campaign accumulated more than 1000 burst detections, more than those from all other telescopes combined in the past 7 years. By February of 2021, four new FRB discoveries have been published based on FAST data. Dedicated FAST observations of known FRB sources have resulted in two publications on Nature, one reveals new magnetic behaviors and one constraints the radio flux of the first Galactic FRB. The latter of which was selected, by both Nature and Science magazines, as part of the top scientific achievements of 2020 world-wide.

 

FAST has discovered more than 200 pulsars, the first 11 of which have been published with coherent timing solution. These dense, rotating neutron stars were once giant stars that collapsed in on themselves. They occasionally pulse an intense radiation beam that can be heard as a radio signal by FAST. FAST has revealed previously unseen complex emission patterns, challenging “the classic carousel-type models”. The science team has also discovered millisecond pulsar binaries in clusters of stars. These millisecond pulsar binaries are thought to be old, paired pulsars that rotate on the scale of millisecond. Among the discoveries is a “black widow spider”, which is consuming its partner star.

 

FAST has also been observing hydrogen gas both in the Milky Way and beyond. Detection of atomic hydrogen in four galaxies allow for a better determination of their baryonic content. By measuring the depth of absorption against the so-called background quasars, which are bright distant stellar like sources driven by central supermassive black holes, scientists have also placed the stringiest limit so far on the molecular content in distant galaxies, using FAST.