“Albert Einstein didn’t like them.
To him, black holes were a bit of an embarrassment, as they compromised his dream of a “rational” nature, that is, natural phenomena that we could describe and quantify with the usual methods of science. According to this view, good scientific theories shouldn’t generate absurd (read: “irrational”) results.”
via Black Holes Orbiting Around Each Other Send Off Waves, : 13.7: Cosmos And Culture : NPR
(Picture from the Washington Post.)
I think most things are knowable, but perhaps not in a lifetime, or even in several lifetimes. In fact, the deeper you get into it, the more effort and the longer it takes. But scientific curiosity should have no limits. We also need more brilliant minds like Einstein’s to carry the search forward.