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    <h1 class="tc">Tachyon</h1>
    <h2 class="tc silver">From Wikipedia, the free encyclopedia</h2>
    <p class="lh-copy f3">A tachyon /ˈtæki.ɒn/ or tachyonic particle is a hypothetical particle that always moves faster than light. Most physicists believe that faster-than-light particles cannot exist because they are not consistent with the known laws of physics. If such particles did exist, they could be used to build a tachyonic antitelephone and send signals faster than light, which (according to special relativity) would lead to violations of causality.</p>
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        <img class="w-50" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/Tachyon04s.gif/500px-Tachyon04s.gif" alt="">
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    <p class="fl w-50">Because a tachyon would always move faster than light, it would not be possible to see it approaching. After a tachyon has passed nearby, we would be able to see two images of it, appearing and departing in opposite directions. The black line is the shock wave of Cherenkov radiation, shown only in one moment of time. This double image effect is most prominent for an observer located directly in the path of a superluminal object (in this example a sphere, shown in grey). The right hand bluish shape is the image formed by the blue-doppler shifted light arriving at the observer—who is located at the apex of the black Cherenkov lines—from the sphere as it approaches. The left-hand reddish image is formed from red-shifted light that leaves the sphere after it passes the observer. Because the object arrives before the light, the observer sees nothing until the sphere starts to pass the observer, after which the image-as-seen-by-the-observer splits into two—one of the arriving sphere (to the right) and one of the departing sphere (to the left).</p>
    <ul class="fl w-50 list bg-light-gray pv3">
        See also
        <li>
            <a href="">Massive particle (bradyon)</a>
        </li>
        <li>
            <a href="">Massless particle (luxon)</a>
        </li>
        <li>
            <a href="">Lorentz-violating neutrino oscillations</a>
        </li>
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            <a href="">Retrocausality</a>
        </li>
        <li>
            <a href="">Tachyonic antitelephone</a>
        </li>
        <li>
            <a href="">Virtual particle</a>
        </li>
        <li>
            <a href="">Wheeler–Feynman absorber theory</a>
        </li>
    </ul>
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