"the theory of gravity, which leads to conclusions about the motion of the planets the existence of vast regions of microgravity where there is no predominate "down", on the other hand is something I doubt you have directly observed."
Is it reduceable to an equation? Has the equation been tested? If so, then it counts. If not, then it is unverified. Unverified theories are very useful -- it is hard to proceed in any direction without an idea of where you are trying to go -- but it is not public unless it can be reduced to testable equations which have passed scrutiny.
The most comprehensive test of the theory of gravity is the path of the voyager spacecraft.
So yes the theory has been tested and failed. The theory of gravity remains a theory that does not match all the observed data. It needs refinement.