In astrophysics self-interacting dark matter is a hypothetical form of dark matter consisting of particles with strong self-interactions. This type of dark matter was postulated to resolve a number of conflicts between observations and simulations on the galactic scale and smaller. Self-interacting dark matter has also been postulated as an explanation for the DAMA annual modulation signal.
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“the cold eternal shores
That look sheer down
To the dark tideless floods of Nothingness
Where all who know may drown.”
—Edwin Arlington Robinson (1869–1935)
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—Willa Cather (1873–1947)