you can repeat an observation of gravity. things fall down. even a detailed observation. things fall with a constant acceleration that is the same, regardless of weight. The speed of a falling object may be altered by the resistance of the air to its passage.
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.
"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.