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## Main Question or Discussion Point

Kip Thorne starts out Chapter 11 of BLACK HOLES AND TIME WARPS with that question.

I wondered what experts here might think of that within the context of the following:

I wondered what experts here might think of that within the context of the following:

Isn't it conceiveable that spacetime is actually flat but the clocks and rulers we use to measure it are actually rubbery?...yes...Both viewpoints give precisely the same predictions for any measurements performed....Some problems are are solved most easily and quickly using the curved spacetime paradigm; others, using the flat spacetime...Black hole problems, for example, are most amenable to curved spacetime techniques; gravitational wave problems (for, example computing the waves produced when two neutron stars orbit each other) are most amenable to flat spacetime techniques....the laws that underlie the two paradigms are mathematically equivalent....That is why physicsts were not content with Einstein's curved spacetime paradigm and have developed the flat spacetime paradigm as a supplement to it...