>one of the biggest mysteries in cosmology.
Of course it could be that cosmology is wrong.
There was a time (until 99 years ago) that the Milky Way was the universe.
Of course it could be that cosmology is wrong.
There was a time (until 99 years ago) that the Milky Way was the universe.
That's true, and physicists are actively working on that possibility, too, under the umbrella term "modified gravity".