- the totality of information available to humanity in any historical context including information from outside the solar system in proportion to how far away it is.
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For instance, if the span of historical relevance of information here ( ie sufficiently verifiable ) is ±10,000 years, the CHE includes the history of a planet 1,000 light years away from -1,000 years ago to -11,000 years ago, and so on outward forever; to the extent that information is adequately verifiable and relevant to be counted as historical fact.
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In short, this encompasses all the knowledge we can possibly have about everywhere in the universe in relation to its distance from us. It expands on the front end as long as we can accurately obtain and retain information, regardless of distance.