Possibly simpler than it looks.<p>410Mpc = 410 megaparsecs, which is about 1.3 billion light years<p>62M⊙ = 62 x the mass of the sun<p>The values have 90% error bars:<p>62+4−4M⊙ = 62 +&#x2F;-4 solar masses<p>As the comments below say, the abstract says that <i>three whole solar masses were converted to gravity waves</i> when the black holes merged.<p>I&#x27;m not sure what the state of research into black hole mergers is, but the science that explains that number is going to be really interesting.