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Every raisin on imatfaal's cake will see the same stretch of space in every direction, and as there is nowhere in space that is the 'center' you are free to define every raisin as that center. Space is isotropic, meaning that it have no differentiating aspects in any direction, and there is no certain 'spot' from where we can say that it 'came'. The BB came not inside a fixed space, it became the space.
if so would it follow from this that galaxies themselves are being stretched by the expansion of the universe? - always more questions
Good answer, imatfaal, but there is another facet to this as well, if the light from some object has taken about 13 billion years to reach us, that object must have been 13 billion light years away from us 13 billion years ago. Surely, this must mean that the Universe was, at the very least, 26 billion L Y across 13 billion years ago.I think this was mentioned elsewhere, but it may have been on a different forum.
|f two galaxies are held together by their own gravity but the space between them expands does this not lead to an increase in the potential energy due to the attraction between them contrary to the energy conservation law ?
No - I think you asked it here, and I thought I answered it - probably just deja vu on my part.
But if you are still interested I will give it a stab when a bit less fuzzy headed