Slower-spinning galaxy bars new evidence for dark matter?
From ScienceDaily: Why do the majority of astronomers believe in dark matter: matter whose composition is unknown but which seems to make up 80% of the mass of the galaxies? The concept was invented in the 1930’s by Fritz Zwicky who used it to explain why the galaxies in the Coma cluster are moving much more quickly than can be explained in terms of their known masses. The most decisive step was taken in the 1970’s by the great Vera Rubin, who showed that the outer parts of galaxies are rotating much more quickly than we can explain using the combined masses of their stars, gas, and dust, and the law of gravity of Newton or Einstein. … In spiral Read More ›