“Those blisters are supernova remnants,” Louise said bitterly. “Spinner, not every star would respond as peacefully to the photino birds’ engineering as did our poor old Sun. A lot of the more spectacular, and beautiful. Population I stars would simply explode, tearing themselves apart... Probably the birds set off chain reactions of supernovae, with the wreckage of one star destabilizing another."
-Ring, Ch. 23