New Recipe for Gravitational Waves Calls for Early Double Stars

Take two massive stars, collapse them into black holes, bake for 10 billion years, and combine. New work shows that that the two stars — the seeds for the first gravitational wave detection — became black holes only a few million years after their birth, then merged more than 10 billion years later. To figure out the primary ingredients of the gravitational waves detected by the Laser Interferometer Gravitational-Wave Observatory (LIGO) in 2015 (and reported this