A if event a occurs on earth at time t0 and event b occurs, Ask an Expert

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A. If event A occurs on Earth at time t=0, and event B occurs in the Proxima Centauri system (41y away) two years in the past, is the separation between these events space like or time like?

B. What is the proper (distance/time) between these two events?

C. How fast would you have to be moving for these events to be (simultaneous/co-locational)?

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