NOVA - 39 Seasons and Going

There are some fascinating and useful shows on the PBS.org website that will help you with setting details and world building.  NOVA, a show now in it's 39th season, is one of the most fun to explore.  Not all of the episodes are up but recently I watch The Pluto Files which details how it became a planet and how planetary status was then removed from it.  These are the sort of conflicts that should be going on in the history of everyone's game world, to be stumbled across during the course of other adventures.  Such conflicts can even be adventures in their own right if the stakes are high enough.

(A Pluto/Earth size comparison from the wiki.)