What happens when black holes collide? | EXPERT ANSWERS PHYSICS GIRL QUESTIONS

Everything is connected, which is In-form-ation cause-effect and temporal superposition logic of quantization that is emulated in a constant-mesh gearbox. 
The speed of light is represented by the peripheral velocity of meshing gears, and if you imagine every gear to be compounded quantum-resonance imaging of the same-in-principle AM-FM communication mechanism of amplitude and frequency modulation we see and hear, then the distance to events of (frequency alignment) collapse and explosion of "gears", is by the same information processing phenomenon as looking and listening to the Observable Universe locally,  with our own sense perceptions. Agreed.

"Stretchiness" of space, (?)singularity positioning of "It's always now" zero-infinity difference distribution in Eternity-now. Relative-resonance of density and intensity information, superimposed mass-energy, is infinitely variable in accordance with the empirically known laws that includes Young's Modulus.

When two BHs merge, one of 3D is squeezed into 2D, and the anharmonics are excluded, it's a kind of neucleonics/chemistry type action and re-action i-reflection axial vanishing point Singularity positioning.

In this case, gravity wave emission is "thermal expansion" by reciprocal conversion of spin, at Zero Kelvin, flat space ground state.

Brilliant Q/A about the light-detection pulse, (I wanted to know but also didn't think about long enough to answer myself). This is how to compare a traveling linear wave-package with a 2D standing wave positioning of the field,  that can then be "time slip" compared with 2 other detectors to find (navigational) orientation to the source. Yea, that is Scientific Science / Physics.

Study Einsteinian Curvatures and Dust Collection Cyclonics, pure relative logarithmic motion cause-effect and Newtonian Fluxions in Calculus context of universal Camera Obscura type Conception.