We've also been observing the universe using neutrinos (generated by the weak force). In fact, there have even been one neutrino event linked to a possible astr

We've also been observing the universe using neutrinos (generated by the weak force). In fact, there have even been one neutrino event linked to a possible astrophysical source[1], but with less certainty than this gravitational wave/EM detection. [1]: https://www.nasa.gov/feature/goddard/2016/nasas-fermi-telescope-helps-link-cosmic-neutrino-to-blazar-blast/ https://www.nasa.gov/feature/goddard/2016/nasas-fermi-telesc...