Jack of Harts

There are many theories as to why intelligent life is so rare.  Some follow the old pre-Space alarmist ideas of global war wiping out civilization as we know it.  Insert global warming, global cooling, stray asteroids, killer plagues, alien attacks, and countless other pet theories.  We’ve found many worlds that actually have suffered from many of them.  What we haven’t found is the remains of dead alien civilizations.