what is the speed of earth as it travels the cosmos,compared with the center of the universe.lets say the big bang starting point.?
It is not a question of not knowing something like the true speed, it is a question of the concept not existing.the true speed at least
From this it is completely unclear to me what your question is.if we dont now the speed or direction of earth we are.but we measure something with a speed in relation of CBM frame.that we cant go over it even in mathematics.and its always the same.can we imagine that this speed may be 0 in relation not the CBM but the space.?!
The speed of light is c, approximately 300,000 km/s, in all non-accelerating reference frames. Note that there is no such thing as a 'cosmos frame'. You cannot assign a frame of reference to space itself or the entire universe.its not zero in relation of CBM frame.it may be zero in relation of cosmos frame.lets say.can it be?
Unlikely.i now,You cannot assign a frame of reference the entire universe,but maybe that is the problem,maybe that is why It doesn't vary whether the observer is moving or not.maybe that is why you cant to go faster.you always can go faster.you can not be slower than zero.thats probable.