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"Speed of Light"
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<blockquote data-quote="Umbran" data-source="post: 6278278" data-attributes="member: 177"><p>They make the situation obvious. Like Edwin Hubble noted, *everything* is moving away from us? Really? *Everything*? How does that make sense? </p><p></p><p></p><p></p><p>It isn't a problem, insofar as we can work with it, once we identify it. It is a problem if we assume that the thing is constant, and interpret our observations as if it were constant, but it isn't!</p><p></p><p></p><p></p><p>Okay, so if you understand that - special relativity, in which the whole "limit to the speed of light" is initially given to us, is about inertial frames of reference. Choosing the rest frame of one of the two particles is an attempt to choose an inertial frame of reference. And, locally, that works. But, on the cosmological scale, that rest frame is not actually an inertial frame, and special relativity does not hold. </p><p></p><p></p><p></p><p>Here's how:</p><p></p><p>Take the expanding universe. The apparent speed of an object is related to the object's distance away from you. This is Hubble's Law: v=H*D, where v is the apparent velocity, and D is the distance. The farther a thing is away from you, the faster it is moving away from you.</p><p></p><p>So, at a given time, an object is some distance away, and moving at some speed away. At a later time, it will then be farther away, and thus moving *faster*. The object is accelerating! </p><p></p><p>But now, we can go back to Newton. Objects at rest stay at rest, unless a force acts upon them. That thing is accelerating, but there's no force acting on it!</p><p></p><p>Moreover, we note that while it is moving quickly relative to us, we can also note that it is *not* moving quickly relative to it's neighbors or its own local space. </p><p></p><p>Voila! We know something is hinkey!</p></blockquote><p></p>
[QUOTE="Umbran, post: 6278278, member: 177"] They make the situation obvious. Like Edwin Hubble noted, *everything* is moving away from us? Really? *Everything*? How does that make sense? It isn't a problem, insofar as we can work with it, once we identify it. It is a problem if we assume that the thing is constant, and interpret our observations as if it were constant, but it isn't! Okay, so if you understand that - special relativity, in which the whole "limit to the speed of light" is initially given to us, is about inertial frames of reference. Choosing the rest frame of one of the two particles is an attempt to choose an inertial frame of reference. And, locally, that works. But, on the cosmological scale, that rest frame is not actually an inertial frame, and special relativity does not hold. Here's how: Take the expanding universe. The apparent speed of an object is related to the object's distance away from you. This is Hubble's Law: v=H*D, where v is the apparent velocity, and D is the distance. The farther a thing is away from you, the faster it is moving away from you. So, at a given time, an object is some distance away, and moving at some speed away. At a later time, it will then be farther away, and thus moving *faster*. The object is accelerating! But now, we can go back to Newton. Objects at rest stay at rest, unless a force acts upon them. That thing is accelerating, but there's no force acting on it! Moreover, we note that while it is moving quickly relative to us, we can also note that it is *not* moving quickly relative to it's neighbors or its own local space. Voila! We know something is hinkey! [/QUOTE]
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