So it's not just one signal, it's something like 100,000, potentially a million merging supermassive black hole binaries all at the same time, creating this, you know, symphony of sound that very low frequencies.
She said that " a contact-binary is when it appears that a single body is composed of two objects that collided gently enough not to become disrupted."
Its largest and closest moon, Charon, is so large compared to Pluto that they actually orbit a point between each other, causing some astronomers to call Pluto and Charon binary, or double, dwarf planets.
They'll have their moments though, because over trillions of years, binary white dwarf orbits will decay, and the stars will merge and explode as supernovae.