Missing dark matter & shadows from a black hole, Hubble continues to unlock cosmic mysteries – NASASpaceflight.com

Its a constant of the universe.  Dark matter – a key ingredient for the formation and evolution of galaxies is present in whatever galaxy is observed.
That is until NGC 1052-DF2 was discovered – a galaxy missing most of its dark matter.  A year later, galaxy NGC 1052-DF4 was discovered 45 million light years from Earth and it too was missing most of its dark matter.
But how is this possible? 
Dark matter accounts for approximately 85% of the matter of the universe and 25% of its overall mass-energy…

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