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"The leading model to interpret FRBs invokes magnetars, the most magnetized neutron stars in the universe," he wrote. "There are two versions of it, one involving the magnetosphere of the magnetar to emit FRBs, another invoking shocks far from the magnetosphere to generate them. This observation disfavors the latter mechanism which has a very low efficiency to generate bursts. Because there are so many bursts produced in a short time, some of them are only separated by milliseconds, it is essentially impossible for the latter model to work. Our results suggest that the bursts are likely produced from the magnetospheres of magnetars, if magnetars are indeed the sources of repeating FRBs.”We already know quite a bit about FRB 121102, due to its status as the first repeater FRB ever detected. For example, we know it has an active phase followed by 67 days of inactivity. We also know that it comes from a dwarf galaxy in a star-forming region of space three billion light years away. But as the new study shows, we definitely don't know enough about this mysterious radio source, or others like it, yet. "My collaboration team is utilising FAST to monitor other repeating FRBs and some unexpected exciting results are being accumulated," Zhang wrote. "Stay tuned!"