But "possible / impossible" seems in itself to be a really useful classifier! Perhaps not worthy of exa-scale computing resource allocation. When it could be p

But "possible / impossible" seems in itself to be a really useful classifier! Perhaps not worthy of exa-scale computing resource allocation. When it could be put to better use in say, nuclear fusion instability prediction. And with the qualifier "possible" conditioned on "known astrophysics by humans in the early 21st Century". But still an interesting tool for likelihood candidate detection. And it still seems constrained to me at least (not a professional astronomer) by the scale of astrophysical phenomena which would be detectable here across the vast expanse of space. It could be an infinite set, certainly. But so far we have cataloged only a handful of significant sources of, in the case of gravitational wave interferometry, bursts: black holes, quasars, pulsars, neutron stars... https://www.ligo.caltech.edu/page/gw-sources https://www.ligo.caltech.edu/page/gw-sources