Dark Matter May Have Put Us Here and Got Rid of the Dinosaurs

A new model of dark matter theorizes a subset of Dark Matter interacts more strongly with itself that the rest does, via a new force. Most of the Dark Matter remains in a spherical halo around each galaxy, as seems to be indicated by observations, but this subset, because it self-interacts, can dissipate energy in a similar fashion to normal matter, and so collapses eventually into a thin, denser, disk, as do the stars in the visible galaxy. It’s the grativational effects of this disk which may have sent an asteroid smashing into the Earth and wiping out the terror-lizards.

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