They're literally the sounds of space ringing, and they will travel out from these black holes at the speed of light as they ring down and coalesce to one spinning, quiet black hole at the end of the day.
これは文字通り空間の響きのことで 光の速さでブラックホールから発散し 鳴り響きながら 結局は回転するブラックホールと 融合します