the.com/galactic rotation
stars orbit the galaxy's center and stubbornly refuse to slow down like they should.
means the observed spinning motion of a galaxy's stars and gas around its core, measured by how orbital speed changes with distance from the center.
from astronomers in the 1970s, notably vera rubin, charted how fast stars at galaxies' edges moved and found the numbers broke newton's math badly.
the anomalyouter stars orbit as fast as inner ones, defying gravity's expected drop-off
the fixinvented dark matter just to make the equations balance
rubin's snubnobel committee never awarded her before she died in 2016
flat curvesrotation speed plateaus instead of declining with radius