Well there\'s many different reasons for Earth\'s gravity, I thought it was mainly because of the sun. Where gravity changed as you left the surface blah blah blah formula for further you are away to determine the GFS. Hell I don\'t remember all my physics...
The sun is so large it makes a gravitational field that makes planets orbit around it. The reason for current planets ability for people to stay on the surface, perhaps is due to the Earth\'s mass balancing the field.
As for PlaneShifts gravity, could it not be due to a big mass (Planet) like I saw posted, outside the surface creating a Gravitational Force. However having a smaller mass on the opposite side with enough mass to keep it from being drug towards the big mass. So it would be hovering between two big masses (planets?) Perhaps the PS Universe is unlike our own? Who created the Universe anyway, why does it have to be like the current?
I was originally thinking if the PS world span fast enough it would cause a Field, however this would end up being a mighty big pain in the ass for people in Yliakum who would not want to be sucked towards the Crystal ;)
So thats my views, seems like everything is coming back to whats proven in our current standings. When in all honesty \"Fantasy\" means we can literally make whatever we want, modify anything and not have it tied to what we know must be true today. Thats the beauty of Fantasy :) Hell maybe there\'s a magnetic strength stopping the two planets from colliding.