If I stood on a theoretical earth at the time that galaxies were just starting to form, what would the sky have looked like?

Due to the smaller size of the universe would it have been densely packed with objects? If yes, what might I have seen?


In early times of galaxy formation you would have seen a sky similar to this Hubble Extreme Deep Field image. A sky filled with small, irregularly shaped, young galaxies and galaxy predecessor fragments (sub-galaxies). Galaxies probably formed bottom-up from smaller fragments.

Further back in time it would have been dark. Hydrogen clouds would begin to contract, as predecessors of first stars (population III) and clusters of stars.

Even further in the past (redshift between 300 and 400) the sky would have been glowing red by what we now call cosmic microwave background.


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