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<blockquote data-quote="Umbran" data-source="post: 7767021" data-attributes="member: 177"><p>If we look at pretty much any galaxy, we can see (via doppler shift of light from stars) how fast the stars in it are orbiting the galaxy's center. They are pretty much all orbiting too fast. When you do the math, they are moving too fast in the exact way you'd expect if the galaxy was far heavier than the sum of all mass of all the stars we can see. </p><p></p><p>In this situation, is it "a hack" to guess that, when it moves as if there's matter you don't see, that there probably *is* some matter we don't see?</p><p></p><p>And, in case you are thinking this, no, the physics community didn't just say, "Hey, there's dark matter there," and move on. They hypothesized that it is there, and have been looking for exactly what it was ever since. As well as looking at other explanations, like modifications to gravity that still fit what we observe in, say, the movements of planets in our Solar System - but none of those other options have worked out yet. So, we have a leading (and simplest) hypothesis.</p><p></p><p>That's all "dark matter" is - a leading hypothesis.</p></blockquote><p></p>
[QUOTE="Umbran, post: 7767021, member: 177"] If we look at pretty much any galaxy, we can see (via doppler shift of light from stars) how fast the stars in it are orbiting the galaxy's center. They are pretty much all orbiting too fast. When you do the math, they are moving too fast in the exact way you'd expect if the galaxy was far heavier than the sum of all mass of all the stars we can see. In this situation, is it "a hack" to guess that, when it moves as if there's matter you don't see, that there probably *is* some matter we don't see? And, in case you are thinking this, no, the physics community didn't just say, "Hey, there's dark matter there," and move on. They hypothesized that it is there, and have been looking for exactly what it was ever since. As well as looking at other explanations, like modifications to gravity that still fit what we observe in, say, the movements of planets in our Solar System - but none of those other options have worked out yet. So, we have a leading (and simplest) hypothesis. That's all "dark matter" is - a leading hypothesis. [/QUOTE]
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