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"Speed of Light"
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<blockquote data-quote="Umbran" data-source="post: 6256374" data-attributes="member: 177"><p>No, we have a pretty good handle on what Time is - at least as good a handle as what "space" is. Now, yes, there's some contention on what that really is down on what is known as the "Planck scale" - the very, very, super tiny down below the sizes of subatomic particles - but for most purposes if you grasp Relativity, you grasp what Time is.</p><p></p><p></p><p></p><p>Make the clock an atomic one, where the ticks are based on the ocillations of electrons in an atom, and no, you can't move the hands with your pinky any more. And, well, all those anti-aging creams don't work anyway, so why mention them? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p></p><p>No. And actually, <em>THAT'S THE ENTIRE POINT</em>!</p><p></p><p>Photons (gauge bosons, massless particles in general) are different from everything else in the Universe. All of relativity ultimately falls out from that one observationally verifiable fact. If you fire off an photon, it goes away from you at 186,000 mps. If you fire off a photon, and then strap the biggest rocket anyone could ever make to your butt, and take off after it, no matter how fast you go, it'll still be travelling away form you at 186,000 mps. It will also look like it is travelling the same speed away from Earth.</p><p></p><p>Relativity is the resolution of that apparent paradox - a viewer "at rest", and one moving wicked darn fast, both think the photon is moving at the same speed.</p></blockquote><p></p>
[QUOTE="Umbran, post: 6256374, member: 177"] No, we have a pretty good handle on what Time is - at least as good a handle as what "space" is. Now, yes, there's some contention on what that really is down on what is known as the "Planck scale" - the very, very, super tiny down below the sizes of subatomic particles - but for most purposes if you grasp Relativity, you grasp what Time is. Make the clock an atomic one, where the ticks are based on the ocillations of electrons in an atom, and no, you can't move the hands with your pinky any more. And, well, all those anti-aging creams don't work anyway, so why mention them? :) No. And actually, [I]THAT'S THE ENTIRE POINT[/I]! Photons (gauge bosons, massless particles in general) are different from everything else in the Universe. All of relativity ultimately falls out from that one observationally verifiable fact. If you fire off an photon, it goes away from you at 186,000 mps. If you fire off a photon, and then strap the biggest rocket anyone could ever make to your butt, and take off after it, no matter how fast you go, it'll still be travelling away form you at 186,000 mps. It will also look like it is travelling the same speed away from Earth. Relativity is the resolution of that apparent paradox - a viewer "at rest", and one moving wicked darn fast, both think the photon is moving at the same speed. [/QUOTE]
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