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The expansion of spacetime. What caused this to happen? It's an interesting question, but nothing had to necessarily cause it.
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So the can not be answered then. The question is not by 'what' created the universe but it relies on 'Who' created the universe. Someone had to do something to create a cause and the effect is the Big Bang
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Why? You only reach this conclusion because everything we experience has a beginning and end. In nature, we correlate events in 'cause' and 'effect' in order to logically interpret them. This is instinctual, but as we study the universe more, the need for a cause to an effect proves to not always be the case. The universe was once infinitely, uniformly dense energy. Why did it clump together and form particles and forces? Because it could.
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I have to disagree with u there... Obviously the dense energy was an effect of something. Obviously the Big Bang was the effect of etc. We might not know what or why it happened, but we don't even know what's in all our oceans and how big they really are because we've only discovered less than five percent. We're not technologically and intelligently advanced enough to figure this out at the moment. That does not mean nothing caused it that just means we do not know the cause of it.
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Edited by The Cellar Door: 4/5/2016 12:48:51 PMI'm simply pointing out that a "cause" is not necessary. This is delving into quantum mechanics and Heisenberg's uncertainty principle (which is not the same thing as the observer effect in that is is irregardless of an observer).
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So something can happen for no reason? I'm pretty sure that fundamentally destroys everything we know.
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Welcome to modern physics.
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Physics is irrelevant if you don't need cause and effect.
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Not really. We may not have deterministic measurements, but we have expectations and randomness that we can understand the world through.