My explanation agrees with that. Both twins are always in the same cosmic now and in the same 3D space at each instant of that universal cosmic "now." Space and time are absolute. (As illustrated in the attached graphic above). Hopefully I can expand on this in another podcast.
Phil
Late on commenting. Time is both absolute and relative. That is required by the presentist interpretation of relativistic physics. Time within the creation as a whole, i.e. the age of the cosmos, is absolute. However, objects moving within the spatial expanse of the cosmos will have relative...