{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-c03aa079.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-517835be.css\" media=\"all\" /\u003e\n\u003cdiv data-title='Why Is the Speed of Light Limited—and What If It Weren’t?' data-url='/boclips/videos/689b21c2c8bf93a4191d018f' data-video-url='/boclips/videos/689b21c2c8bf93a4191d018f' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nWhy Is the Speed of Light Limited—and What If It Weren’t?\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30356011\" href=\"/search?publisher_ids%5B%5D=30356011\"\u003eCurated Video\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eWhy does the universe have an upper speed limit on the speed of light? Why isn’t the top limit infinite? Or what if the speed of light was not constant but changed in different reference frames? The speed of light is dependent on two...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eWhy does the universe have an upper speed limit on the speed of light? Why isn’t the top limit infinite? Or what if the speed of light was not constant but changed in different reference frames? \u003cbr/\u003e\u003cbr/\u003eThe speed of light is dependent on two fundamental properties of space, the vacuum permittivity and permeability. These are measured constants with no theory to explain them. These constants represent the resistance of space to the propagation of electromagnetic waves. Since space exhibits a resistance to EM wave propagation, this sets a finite limit to the speed of light. If this resistance was much lower or nonexistent, then the speed of light would be much faster, or perhaps infinite.\u003cbr/\u003e\u003cbr/\u003eThe physical significance of the speed of light is that it's the upper limit of how fast information can flow. It is linked to causality and locality. If you are separated by some distance from an object. You cannot know anything about that object instantly. \u003cbr/\u003e\u003cbr/\u003eIf information could flow instantaneously from one part of the universe to another, it would mean that an event happening at any point in the universe could affect every other point. If there were a million hypernovae at any instant in space, this could kill us instantly because we would experience them simultaneously here on earth. \u003cbr/\u003e\u003cbr/\u003eThere would be no locality, which  is the idea that objects in the universe are directly influenced only by their immediate surroundings. \u003cbr/\u003e\u003cbr/\u003eEinstein’s Special relativity guarantees that there is no such thing as simultaneity. How would this break causality?  Consider two events. If one observer determines that A caused B, a finite speed of light guarantees that all observers in all reference frames will also agree that A caused B, because in order for this not to be the case, information would have to travel back in time.  In a universe with an infinite speed of light, observers would not be able to agree on the ordering of events, so there would be no agreement on causality. \u003cbr/\u003e\u003cbr/\u003eWe would have no sense of the history of the universe. There would be no redshift. We would not see the microwave background radiation, CMB. We would see the universe as it is in the current moment. But we would also see the full size of the universe, and know whether it was infinite or not. \u003cbr/\u003e\u003cbr/\u003eThe night sky would be completely lit up, because we would see all the light from all the stars everywhere in the universe simultaneously. \u003cbr/\u003e\u003cbr/\u003eBut an infinite speed of light would have a fundamental problem. If E=MC^2 is still correct, it would mean a universe with no mass, all energy. Since M = E/C^2. The higher the value of C, the more energy it takes to create mass. An infinite value of C would result in not being able to create any mass, regardless of how much energy we had. But note that E=MC^2 is based on Einstein’s special relativity, which is based on the idea that the speed of light is constant and finite, so this equation might not be valid. \u003cbr/\u003e\u003cbr/\u003eLight speed is observer independent. You would measure the speed of light to be the same regardless of how fast you were traveling. How is that possible? Because time for the person traveling fast would run slower from the perspective of the person standing still. \u003cbr/\u003e\u003cbr/\u003eThis observer independence is necessary, otherwise there would not be a maximum speed limit because it would be different for different observers. \u003cbr/\u003e\u003cbr/\u003eVarying speed of light would mean relativity is wrong,Quantum field theory would wrong. There would be no spacetime. Quantum mechanics may be salvageable. But causality would go out the window. The Big Bang would also have to be thrown out. \u003cbr/\u003e\u003cbr/\u003eYou may even have to bring back the idea of the luminiferous aether to explain how light moves according a fixed reference frame of the universe. \u003cbr/\u003e\u003cbr/\u003eWhy does the universe care about electromagnetic waves? Why is this speed of light so important in physics? What it cares about is causality, which is the maximum speed limit. And light just happens to have this maximum speed. Because photons have no mass, they can travel with no restriction. \u003cbr/\u003e#speedoflight\u003cbr/\u003eAnother way to look at this maximum speed is to think about how Space and time are equivalent in special relativity. \u003cbr/\u003eThe conversion factor that unites space and time in our universe is the maximum speed of causality, the speed of light.\u003cbr/\u003e\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='action-container flex justify-between'\u003e\n\u003cbutton aria-expanded='false' aria-label='Read more description' class='rp-full-description' type='button'\u003e\n\u003ci class='fai fa-solid fa-align-left'\u003e\u003c/i\u003e\n\u003cspan id='read_more'\u003eRead More\u003c/span\u003e\n\u003c/button\u003e\n\u003cdiv class='rp-report'\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv aria-labelledby='resource-details-heading' class='rp-info-section'\u003e\n\u003ch2 class='title' id='resource-details-heading'\u003eResource Details\u003c/h2\u003e\n\u003cdiv 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