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Originally Posted by JinnKai
I don't understand why it's conical and not linear? Wouldn't the advancement of time cause the light at the current time to always be in a linear translation from the previous time? In that case, the light cone is only useful for talking about DURING motion, not at actual finite states..?
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Well, it
is linear, it's just in three dimensions. Take a diagonal line and spin it around it's axis, and you get a cone.