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May 10 at 1:11 comment added Chappo Hasn't Forgotten Your "other way to get the relativistic train to high speed" is marvellous, & underlines the importance of identifying which frame of reference makes the problem easiest to (a) understand and/or (b) do the maths on. It's like the Earth vs the Universe: there's simplicity in taking the Earth as the stationary frame with the entire Universe revolving around it, but the physics quickly gets awkward when you start bringing other bodies (e.g. planets) into it. The geocentric frame isn't wrong, but it certainly has its limitations.
May 4 at 7:21 history answered JEB CC BY-SA 4.0