ceased to interact
... that according to Big Bang cosmology, neutrinos, a type of elementary particle, ceased to interact significantly with the other constituents of the Universe about one second after the Big Bang?
... that according to <a href="./Big_Bang" id="mwEkk" rel="mw:WikiLink" title="Big Bang">Big Bang</a> <a href="./Cosmology" id="mwEko" rel="mw:WikiLink" title="Cosmology">cosmology</a>, <a class="mw-redirect" href="./Neutrinos" id="mwEks" rel="mw:WikiLink" title="Neutrinos">neutrinos</a>, a type of <a href="./Elementary_particle" id="mwEkw" rel="mw:WikiLink" title="Elementary particle">elementary particle</a>, <b id="mwEk0"><a href="./Neutrino_decoupling" id="mwEk4" rel="mw:WikiLink" title="Neutrino decoupling">ceased to interact</a></b> significantly with the other constituents of the <a href="./Universe" id="mwEk8" rel="mw:WikiLink" title="Universe">Universe</a> about one second after the Big Bang?