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Re:A Binary Star Is About to Go Supernova and Could Produce ... by JumpCrisscross on Tuesday November 20, 2018 @04:36PM (#18497990)
> Talking to an astronaut on Mars

All these ambiguities disappear if you choose a reference frame. From our reference frame, the explosion hasn’t happened. From the stars’, it might have. The issue is popular imagination, and thus common language, deals with reference frames sloppily.

Re:A Binary Star Is About to Go Supernova and Could Produce ... by flukus on Tuesday November 20, 2018 @05:50PM (#18498600)
> common language, deals with reference frames sloppily.

I deals with it fantastically, unless otherwise stated it's implied we are talking in the local reference frame. That convention gives us nearly infinite information density because we don't have to state it.