The terrestrial search is nearing the end, but that's not necessarily the end for all of time, just the end for a few generations of particle physicists. We're

The terrestrial search is nearing the end, but that's not necessarily the end for all of time, just the end for a few generations of particle physicists. We're at 1AU from the sun. Titan is at 10AU from the sun, has a thick atmosphere to aerobrake into, has remarkably varied topography (including pools of liquid one could submerge detectors in), and will have one hundredth the solar neutrino flux. Neptune is at 30 AU: Add another order of magnitude if you figure out how to work a gas giant to your ends (and a beer on me). If you can work in vacuum there's not only Triton, but with microgravity operations, the whole Kuiper Belt & Oort cloud out there to use as in-place shielding against GCRs.