Jack of Harts

Another answer given to the Fermi paradox was that perhaps it was the nature of all life to destroy itself in the end.  When we went into space, we found worlds ready to be inhabited, far more than we ever expected.  What our governments didn’t publish was that many showed signs of terraforming, and the ruins of dead civilizations were not rare.  We saw on those planets our future, and that was why we signed the Lunar Treaty and all of its descendents.