Many of Asimov's science fiction novels, either by original design or later retconning, take place in the same shared universe. Most prominently in that universe, we find Hari Seldon's "Foundation" - but the Robot novels, Pebbles in the Sky, The Currents of Space and many others all take place in this same "shared universe."
I have never been able to definitively determine if his novel The Gods Themselves is supposed to be part of this same universe - I can find no hard evidence one way or the other.
Has anyone seen any passages in any of the novels that would preclude or support this novel taking place in the same shared universe?