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The past is the portion of time that has already occurred;[1] it is the opposite of the future. The past is contrasted with the present. It is also regarded as the conglomerate of events that happened in a certain point in time, within the Space-time continuum. The aforementioned conception is closely related to Albert Einstein's relativity theory. The past is the object of such fields as history, archaeology, archaeoastronomy, chronology, geology, (historical geology), historical linguistics, law, paleontology, paleobotany, paleoethnobotany, palaeogeography, paleoclimatology, and cosmology. Humans have recorded the past since ancient times, and to some extent, one of the defining characteristics of human beings is that they are able to record the past, recall it, remember it and confront it with the current state of affairs, thus enabling them to plan accordingly for the future, and to theorise about it as well. According to presentism, the past does not strictly exist; however, the methods of all sciences study the world's past, through the process of evaluating evidence. Presentism is compatible with Galilean relativity, in which time is independent of space but is probably incompatible with Lorentzian/Einsteinian relativity in conjunction with certain other philosophical theses which many find uncontroversial.
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