[Vicomte13]

"They're still upset about not being able to measure the ether."

Bingo.
They proved there's no "ether".
But if the space-time grid's real, and a real background fixed grid (if expanding) to be warped, then by gum there IS an ether, of sorts, after all. And what's more, there's specific relativity of one thing to another, but relativity is not general: there is a fixed and absolute reference point, the grid.

Einstein would not be pleased.

[VadeRetro]

But if the space-time grid's real...

Is this the first you've heard of the expansion of the universe? It does not conflict with relativity. Relativity at first predicted it, although Einstein was unnerved enough to find a way to revise that feature out. The universe has some finite volume (although incredibly huge, far far bigger than the part we can see) but no edge or surface. Within it, everything is still relative to the observer's frame of reference. Outside of it... who knows?

[frithguild]

the universe went through extremely rapid expansion in the moments after the big bang, growing from the size of a marble to a volume larger than all of observable space in less than a trillion-trillionth of a second.

So let me see if I understand. When the universe was the size of a marble, matter was so densely packed that certain radioactive radiation could not exist?

"And God said, 'Let there be light,' and there was light. God saw that the light was good, and He separated the light from the darkness."