Can anybody say what is the speed of dark
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This mysterious energy makes up 80 percent of all matter in the universe. In a 2013 study, scientists determined that dark matter should have a speed of 54 meters per second, or 177 feet -- slow compared to the speed of light [source: Armendariz-Picon and Neelakanta].
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Darkness is the absence of light. so, since all light have to leave an area before darkness arrive it follow logically that the speed of darkness is equal to the speed of light
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