All disk galaxies rotate once every billion years: study
This is extremely suspicious for various theories of dark matter, right?<p>How is it that all disk galaxies have just enough dark matter in just the right distribution to make up for the various radii and distributions of visible matter and end up rotating at the same rate?<p>I have no answers, but as they say, the most interesting words in science are, &quot;Huh, that&#x27;s funny...&quot;