Lack of ‘dark matter’ in early galaxies perplexes astronomers — So where did all the dark matter come from?

It may seem like we’ve got the universe pretty much figured out. We have a relatively good idea about how it started and how it is evolving. We’ve sent probes to neighbouring planets, discovered an increasing number of exoplanets and are cataloguing the family tree of galaxies.

But there is some pretty basic stuff that we just don’t have a clue about — such as what the vast majority of the cosmos is actually made of. For example, for all the matter we can see in the universe, there is at least five times more invisible material called “dark matter”…

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