What do "red nugget galaxies" found at high redshifts suggest about early cosmic structure formation?

Answer

That a significant portion of the mass for massive ellipticals was already assembled very early.

Red nugget galaxies, found to be compact and rich in old stars at high redshifts, suggest that the bulk mass of what will become massive elliptical galaxies was assembled much earlier than previously theorized.

What do "red nugget galaxies" found at high redshifts suggest about early cosmic structure formation?

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