While it is true that gravity is described by a theory (specifically, Einstein's theory of general relativity), it does not imply that most of physics may not be true. Theories in physics are models that provide explanations and predictions based on our current understanding of the natural world. They are developed through rigorous scientific methods, including experimentation, observation, and mathematical formulations.
Gravity is a fundamental force that plays a significant role in our understanding of the universe. General relativity, the theory that describes gravity, has been extensively tested and has successfully explained a wide range of phenomena, from the motion of planets and stars to the bending of light around massive objects. It is considered one of the most successful theories in physics.
However, it is important to note that scientific theories are subject to refinement and revision as new evidence and observations emerge. Scientific progress involves constantly refining and expanding our understanding of the natural world. For example, general relativity is currently being explored in the context of extreme conditions, such as black holes and the early universe, where its predictions may need to be modified or reconciled with other theories, such as quantum mechanics.
Physics encompasses a wide range of phenomena beyond just gravity, including electromagnetism, quantum mechanics, thermodynamics, and particle physics, among others. Each of these areas has its own theories and models that have been extensively tested and verified through experiments and observations.
While our understanding of the universe is constantly evolving, the scientific process and the theories that have been developed provide a reliable framework for explaining and predicting natural phenomena. Scientific theories are not absolute truths, but they are the most accurate descriptions of the natural world that we currently have based on the available evidence.