As a previous fully paid-up member of the Theoretical Physics clan, this discovery is remarkable from a detection perspective.
Essentially, Einstein postulated wave solutions to his general relativity equations, and that these would manifest in changes in space – stretching and contracting.
The magnitude of these changes are staggeringly small. LIGO are claiming to have detected a perturbation of one millionth of the diameter of a proton. A proton, not an atom. Think about that for the moment.
What they have done is detect two signals in two large detectors, separated in time by roughly distance divided by the speed of light.
Having seen a signal, they have postulated the massess that need to move to generate such perturbations, and these are mind-blowing – two black holes moving at a high fraction of the speed of light are needed. The model of this is compared with the (heavily processed) signals to show some correspondence.
Fundamental research is just that. It may have spin offs, but that is not the point. And who knows what those involved may subsequently go on to do. This Theoretical Physicist uses the skills he acquired to work on developing new cancer treatments.
BTW – I’m actually sceptical of the detection, and decided not to do my PhD in gravitational wave detection, and I don’t care too much for Star Wars. The subject of my PhD was in a Star Trek TNG episode though 🙂