Your last comment about chances shows misunderstanding of how science and/or statistics work. We have not tested our theories in every possible way, so yes, we

Your last comment about chances shows misunderstanding of how science and/or statistics work. We have not tested our theories in every possible way, so yes, we know they will need updating here and there. However, there is an immense body of work pointing to no "antigravity", so the chance of a surprising result from this experiment is vanishingly small. If you are interested, check out Feynman's Quantum Field Theory textbook where he quite descriptively puts constraints on tensor interactions (like gravity). I would be happy to suggest more introductory books if you are interested.