On Sat, May 24, 2025 at 3:46 AM Alan Grayson <[email protected]> wrote:
Einstein quote: "*The gravitational field has only a relative existence in a way similar to the electric field generated by magnetoelectric induction" * *> What does the sentence emphasized by me, mean? TY, AG* > *Electric fields and magnetic fields are relative, one man's electric field is another man's magnetic field and vice versa. So in General Relativity there is no such thing as an electric field or a magnetic field, although they can often be useful fictions, there is only an electrodynamic field. In the same way a gravitational field is a useful fiction, it's not fundamental, it's relative. An observer in a rocket without a porthole accelerating at 1G will see a gravitational field, but an observer outside would see no such field, he would just see a rocket accelerating in a way that Isaac Newton would understand. * * John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>* 4$b -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAJPayv0upnzX3y_JCEbEG%3Dp0ey2Wbv_iVsKNjOUi%3DG9C%2BR00jQ%40mail.gmail.com.
