Ideas about string theory, superstring theory, tachyons, etc., all tell us that there are incomplete ideas about time and relativity.
All science models are ultimately incomplete. Granted, we can get to many decimal places of accuracy, but there is always something more. Gravity is considered a law (and most now consider General and Special Relativity laws as well) because of what we do know, but they still are not fully complete. Never will be either.