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Apparently, a great deal of dark, unseen material exists, whose gravitational pull is responsible for the motions of the stars and galaxies that we see.

John D. Barrow
Stars, Dark, Unseen
John D Barrow (2014). “The Origin Of The Universe: Science Masters Series”, p.70, Basic Books
Apparently, a great deal of dark, unseen material exists, whose gravitational pull is responsible for the motions of the stars and galaxies that we see.