The “stretching” or the “spreading out” of the heavens is a theme in scripture …Job 9:8; Psalm 104:2; Isaiah 40:22; 42:5; 44:24; 45:12; 51:13
Looking for a naturalistic/repeatable/testable solution to a divine event seems doomed from the onset to me.
I think what we “see” today from our perspective, can fit nicely with scripture and can also accommodate a Young Creation. In my simple mind anyway.
The above texts give some interesting clues.
Again, I would raise my previous example of ten men standing with lit lanterns in a tight circle at night, then “explode” them by having them each run in different directions outward until they tire.
The “explosion” or creation event would be initially very very fast then would slow down, just as we see today.
This event would take Gods created material, suns and stars, very far from our current position, very quickly….giving us what we see today.
So when observing amazing events like supernovas, are we merely seeing an event that is now very very far away, yet during the creation week, was not that far away? How fast did God “stretch” the Heavens?
I don’t think we will ever know
Just some thoughts anyway.