B-theory of time is a philosophical concept in the study of time that posits that the passage of time is not an objective feature of reality, but rather a subjective experience. According to B-theory, all points in time—past, present, and future—are equally real. This theory contrasts with A-theory (or "A-series" of time), which holds that the present moment is uniquely real, while past events are no longer real and future events are not yet real.
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