Newly Discovered Gravitational Waves Hint that “Cities” of Black Holes May Lurk in Space

For the third time in less than two years, physicists have detected billion-year-old ripples in the fabric of space-time. The new recording, like the two others before it, was made using the Laser Interferometer Gravitational-Wave Observatory (LIGO). . . . LIGO's third detection is striking, but researchers say its importance lies in the story it's helping to tell about black holes—one of the most powerful yet enigmatic forces of nature.

Read more about the detection that Member Timothy Brandt calls a "lovely, wonderful discovery" that "fills in a gap perfectly" between LIGO's first and second detections, which formed black holes of about 21 and 62 solar masses, respectively.