sciencebriefs
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The universe

Everything there is, most of it unobserved.

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Galaxy rotation curve

Vera Rubin and Kent Ford measured how fast stars orbit at the edges of spiral galaxies and found speeds that refused to fall off with distance, evidence that most of a galaxy's mass is invisible.
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Large-scale structure of the universe

Mapping galaxy positions in three dimensions revealed a vast web of filaments and voids, a structure dark-matter simulations had already anticipated, though the largest structures found still test how uniform the universe is supposed to be.