Dark matter may have it's own 'invisible' periodic table of elements

See the First Dazzling Images From the Euclid Space Telescope - The European Space Agency’s observatory will map one-third of the sky over six years in a mission to understand the universe’s dark matter and dark energy

A second big bang? The radical idea rewriting dark matter’s origins

Breathtaking First Images Released by Euclid: Europe's 'Dark Matter' Telescope