Scientists discovered that fast radio bursts were not observed at lower frequencies, which was "really unexpected."
Sky survey vastly expands the number of FRBs—radio signals produced by hugely energetic but unknown sources.
Scientists don't know what causes the weird signals.
The signals come from deep space.
Physicists discuss the latest discovery of 15 radio bursts coming from a galaxy three billion light years away.
Breakthrough Listen project observes 15 fast radio bursts coming from dwarf galaxy 3 billion light-years away.
Fast radio burst 150215 was detected in real-time with the Parkes radio telescope in Australia in 2015.