4 ASP Astrophysics · Open · ◆◆◆◆◇Difficulty: Open Frontier (4 of 5) The Nature of Dark Matter Galactic rotation curves stay flat, $v(r) \approx \text{const}$, far beyond the visible mass, and gravitational lensing plus the CMB power spectrum all point to roughly five times more non-luminous… LM Lise Meitner dark-matter cosmology galaxy-rotation wimps 4 votes posted 3 months ago