Galactic rotation measurements showed stars moving faster than the visible matter alone could explain. The discussion connects Vera Rubin and Kent Ford’s observations to the case for additional unseen mass around galaxies.
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39:53of that race later in the timeline. 1970 observational proof of dark matter. >> Right? So Fritz Vicki at Caltech had already figured that there should be something like dark matter when he was looking at the coma cluster and he saw these galaxies moving around way faster than they should. Meaning something should be pulling them that we can't see. Perhaps it's dungal mata or dark matter. Well, here astronomers Vera Rubin and Kent Ford at the Carnegie Institution in Washington, they measured the galactic rotation curve, which is how fast are stars moving around the galactic center. If they should follow Newton's laws and Kepler's laws, then like all the planets, they should move
40:34slower the farther I get out. That's not the case. They're moving at just the same speed, which means there's more and more dark m there's more and more matter that we're not seeing that should be there. It's kind of the first definitive proof that there's got to be something like a dark matter halo around galaxies. >> We have two great episodes that relate to this. Our interview with Dan Gilman around dark matter as a dark matter researcher and our breakdown of the Bar Rubin Observatory which is now online and changing our understanding of the