We know one filter. But to paraphrase Donald Rumsfeld, we don't know about the filters we don't know about. Something akin to a gamma ray burst (not that exac

We know one filter. But to paraphrase Donald Rumsfeld, we don't know about the filters we don't know about. Something akin to a gamma ray burst (not that exactly, since we do know about it but something like it) So the Great Filter theory is one way to reason about the filters we DON'T know about