“…no light…”

“… much of the matter in spiral galaxies emits no light. Moreover, it is not concentrated near the center of the galaxies …”

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“Originally astronomers de­scribed the nonluminous component as “missing matter.” Today they recognize that it is not missing; it is just not visible.”

  • Vera C. Rubin, “Dark Matter in Spiral Galaxies” – Scientific American, Vol. 248, No. 6 (June 1983)

[Thanks to Lucien Raphmaj who instagrammaticalized V.C.R.]