Compared to the number of visible galaxies, how common might smaller, unseen dark halos be, according to analytical comparisons of simulations?

Answer

For every galaxy observed, there may be dozens, perhaps hundreds, of smaller halos.

The visible universe is seen as the luminous froth atop a massive gravitational sea, implying that the majority of mass resides in halos that never ignited fusion.

Compared to the number of visible galaxies, how common might smaller, unseen dark halos be, according to analytical comparisons of simulations?

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