* Relativity: The concepts of rest and motion are relative. They depend on the frame of reference from which an object is being observed. For example:
* A person sitting on a train is at rest relative to the train, but in motion relative to someone standing on the platform.
* No absolute frame: There is no absolute frame of reference in the universe. This is a fundamental principle of Einstein's theory of relativity.
Therefore, it's impossible to say definitively whether an object is "truly" at rest or in motion. We can only describe its state relative to a chosen frame of reference.
