Elusive Gravity Waves
Quite a lot of effort has gone into the theory, construction and opertation of a planetarily distributed network of gravitometric installations in search of gravity waves. Such efforts have not been successful and may be in vain, whether or not gravity waves exist.
The search for gravity waves may be more difficult than experiments such as LIGO suggest.
If gravity waves exist, they're not going to be neat in their impact on any target or necessarily identifiable as coupled to a specific source. They are more likely to resemble Victor Hugo's description of bizarre sea wave patterns forced through channels described in his book The Laborers of the Sea (Les travailleurs de la mer) as these gravity waves carom about the universe in interference patterns beyond the ability of the present math to delimn.
Furthermore, mass calls to mass. As the LIGO math depends on isolating readings from seismic noise, gravity wave activity will be filtered out as it will be received primarily as a seismic event. If gravity waves exist, our planet is vibrating in their complex oscillation constantly.
If a true gravitometric device could be constructed, it would probably sound off constantly with the ebb and flow and ripple. As it is, our child's acorn-boat of a solar system rises and falls with such waves, if they exist, imperceptibly to any man-size-scaled device that can be contrived as that device is carried along with it all.
The methodological error in LIGO is then one of flawed tacit assessment of the impact of a differential in scale.