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Reference.org
Causality (physics)
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<p>Causality is the relationship between causes and effects. While causality is also a topic studied from the perspectives of philosophy and physics, it is <a href="/facts/Operationalized/nm5Tff9F">operationalized</a> so that causes of an event must be in the past <a href="/facts/Light_cone/GwJ0Yhjf">light cone</a> of the event and ultimately <a href="/facts/Reductionism/tc2aWaza">reducible</a> to <a href="/facts/Fundamental_interaction/WrFEJaFl">fundamental interactions</a>. Similarly, a cause cannot have an effect outside its future light cone. </p>