FRB UPDATE Part 2: Repeating Fast Radio Burst Opens Up the Playing Field

When I first wrote about Fast Radio Bursts (FRBs -- and please read the follow-up on that) -- sudden cosmic blasts of radio waves that come and go in milliseconds -- I mentioned that lots of different unrelated phenomena can probably produce them. Radio waves are generated by planets, stars, gas clouds, black holes, and a host of other astronomical objects, so there's no reason to limit ourselves when we think of what their source might be. Not only that, but gamma-ray bursts, the second most...