2 ms·
The issue is that "now" is not well-defined since it depends on the reference frame. Therefore what we consider "already happened" another observer may conside
by btilly 8y ago
The issue is that "now" is not well-defined since it depends on the reference frame. Therefore what we consider "already happened" another observer may consider "still in the future".
All observers will agree on the order of events if and only if the light from each event traveled to the next before the next happened.
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