The latest signal comes from the final moments when two black holes – one 14 times the mass of the Sun and the other eight times the size – merged to create a massive, spinning black hole 21 times the mass of the Sun.
And from the article abstract: The inferred source-frame initial black hole masses are 14.2 +8.3 −3.7 M ⊙ and 7.5 +2.3 −2.3 M ⊙ , and the final black hole mass is 20.8 +6.1 −1.7 M ⊙ .
So I'm curious... what happened to the "missing" mass?
This obviously some serious boffinry being done.