Week 6, clip 6

Timepoint:  11:47.7

1) How many distinct regions are there in a spacetime diagram?  Consider a diagram with two spatial dimensions and one temporal (time) dimension.

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Answers:
1) 3

Explanation:
Within the future light cone ( s^2 > 0, t > 0)
Within the past light cone ( s^2 > 0, t < 0)
The acausal region outside of the event's light cone ( s^2 < 0)<br>