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    <title>Speed of light</title>
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    <h1 id="speed-of-light">Speed of light</h1>
    <p>From Wikipedia, the free encyclopedia</p>
    <p>
      The <strong>speed of light</strong> in <a href="/wiki/Vacuum" title="Vacuum">vacuum</a>, commonly denoted <strong>c</strong>, is a universal
      <a href="/wiki/Physical_constant" title="Physical constant">physical constant</a> important in many areas of <a href="/wiki/Physics" title="Physics">physics</a>. Its exact value is defined as
      299792458 metres per second (approximately 300000 km/s, or 186000 mi/s).<a href="#cite_note-imperial-4">[Note 3]</a> It is exact because, by international agreement, a
      <a href="/wiki/Metre#Speed_of_light_definition" title="Metre">metre</a> is defined as the length of the path travelled by <a href="/wiki/Light" title="Light">light</a> in vacuum during a time
      interval of .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac
      .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}1⁄299792458
      <a href="/wiki/Second" title="Second">second</a>.<a href="#cite_note-6">[Note 4]</a><a href="#cite_note-penrose-7">[3]</a> According to
      <a href="/wiki/Special_relativity" title="Special relativity">special relativity</a>, c is the upper limit for the speed at which conventional <a href="/wiki/Matter" title="Matter">matter</a>,
      energy or any <a href="/wiki/Signal" title="Signal">signal</a> carrying information can travel through <a href="/wiki/Space#Relativity" title="Space">space</a>.
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      Though this speed is most commonly...