The Percolation Theory reasons that Earth might linger in an uninteresting part of the Milky Way: its galactic backwaters. See:
* [1998] http://www.geoffreylandis.com/percolation.htp
* [2014] https://arxiv.org/abs/1404.0204
* [1998] http://www.geoffreylandis.com/percolation.htp
* [2014] https://arxiv.org/abs/1404.0204
[1] https://en.wikipedia.org/wiki/The_Eerie_Silence [2] https://en.wikipedia.org/wiki/Percolation_theory