We can’t say that spacetime exists in all the universe as we know it here. So unless you are only referring to light moving here in this solar system and area, you cannot talk about a speed for light. No one has gone out to the far universe to experience light moving there. We do not even know that time as we know it here exists out there! - dad1 - #346275
We can say that spacetime exists in all the universe as we know it here. Because it is the universe we know, and no messurement or observation we did of that universe did ever contradict the assumtion that spacetime exists.
It is called the Observable universe, everithing of the universe that we can actually observe.
Outside of this Observable universe we have indeed no observation and messurement at all and everithing is experience based assumtion.
Here would refer to where man has actually been, or at least where his probes have gone. There would be further than that. - dad1 - #346302
No. You observe only here in the area or, if you will, inside the ‘fishbowl’. If for example time itself were not the same in and out of the fishbowl, then what you observe IN the fishbowl does not apply outside. (at least not that we know) - dad1 - #346315
Here you are greatly mistaken, you observe quite a bit more than just from the furthes extend of Voyager1 ("…it is the most distant man-made object from Earth."; https://en.wikipedia.org/wiki/Voyager_1
). You should propably know that but all the stars you can even see with your naked eye in a clear night lying way outside our solar-system. And yet you say: “No. You observe only here in the area…” “Here would refer to where man has actually been, or at least where his probes have gone.”
It is very clear that you observe far more than that.
"Do you have any experience, knowledge or expertise that says it is different?"
No man has any to say it is either, the same or different. Believe what you will. It is not science.
“I believe that would be the “Cosmological Principle” that write4u wrote for you. To put it in simpler terms – “We’re nothing special” (though that also reaches into other theories and principles as well)”
That principle is purely belief based. - dad1- #346400
It is not a belief nor is it belief based, its an assumtion. And as soon as this assumtion gets proven incorrect it will be adapted accordingly.
This is most basic scientific method. Science doesn’t care about belief it only cares about evidence.
You are surrounded by time and space here. Do not tell us that time exists the same outside your area of experience and knowledge and expertise. - dad1-#346393
No one did tell that. Our area of experience and knowledge covers the observable universe instead of just our solar-system, this is the only difference. And with every observation outside of our solar-system your claim that says otherwhise is proven incorrect. And if you where to accept the scientific method you should please stop arguing about that in this thread/topic. Because this isn't the the actual discussion.