Indeed swirling galaxys in an ocean of what?.. Dark energy?, matter?... both?..
Light energy/matter?... Dark energy/matter?..
Could be space is NOT empty..
But a coriolis effect seems to be universally present.. Its true on this planet that the coriolis effect turns one way in the northen hemisphere and revolves the other way in the southern.. maybe all we see is a part of the universe and that the universe is not expanding but revolving..
What a state of affairs when even what we think "is material" may not be.. since "we" don't know what material even is.. Material might be designated energy and energy is just matter undesignated.. like water(STEAM) and ice..
How would this be observed aside from on a rotating planet?