The concept of mass in general relativity (GR) is more complex than the concept of mass in special relativity. In fact, general relativity does not offer a single definition for the term mass, but offers several different definitions which are applicable under different circumstances. Under some circumstances, the mass of a system in general relativity may not even be defined.
Read more about Mass In General Relativity: Review of Mass in Special Relativity, Defining Mass in General Relativity: Concepts and Obstacles, History, Questions, Answers, and Simple Examples of Mass in General Relativity
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—Albert Einstein (1879–1955)