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  1. en.wikipedia.org › wiki › Speed_of_LightSpeed of light - Wikipedia

    The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).

  2. www.britannica.com › science › speed-of-lightSpeed of light | Definition, Equation, Constant, & Facts

    Jul 16, 2024 · Speed of light, speed at which light waves propagate through different materials. In a vacuum, the speed of light is 299,792,458 meters per second. The speed of light is considered a fundamental constant of nature.

  3. www.space.com › 15830-light-speedHow fast does light travel? | The speed of light | Space

    May 17, 2023 · The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. That's about 186,282 miles per second — a universal constant known in...

  4. nineplanets.org › questions › how-fast-is-the-speed-of-lightIs There Anything Faster Than the Speed of Light? - The Nine...

    Sep 29, 2020 · In miles per hour/mph, the speed of light is at around 670,616,629, while in kilometers per hour, light travels at 1,079,252,848. In terms of seconds, light travels at around 300,000 kilometers per second or 186,000 miles per second in a vacuum.

  5. www.omnicalculator.com › physics › speed-of-lightSpeed of Light Calculator

    Jul 16, 2024 · The speed of light is 299,792,458 m/s in a vacuum. The speed of light in mph is 670,616,629 mph . With this speed, one can go around the globe more than 400,000 times in a minute!

  6. sciencenotes.org › what-is-the-speed-of-lightWhat Is the Speed of Light? - Science Notes and Projects

    Apr 11, 2021 · The speed of light is the rate at which light travels. The speed of light in a vacuum is a constant value that is denoted by the letter c and is defined as exactly 299,792,458 meters per second. Visible light , other electromagnetic radiation, gravity waves, and other massless particles travel at c. Matter , which has mass, can approach the ...

  7. www.astronomy.com › science › speed-of-light-realitys-speed-limit-explainedSpeed of light: How fast light travels, explained simply and...

    Jan 23, 2024 · On one hand, the speed of light is just a number: 299,792,458 meters per second. And on the other, it’s one of the most important constants that appears in nature and defines the...

  8. www.space.com › speed-of-light-properties-explainedWhy is the speed of light the way it is? | Space

    Jul 16, 2020 · We all know and love the speed of light — 299,792,458 meters per second — but why does it have the value that it does? Why isn't it some other number? And why do we care so much about some...

  9. www.wikiwand.com › en › Speed_of_lightSpeed of light - Wikiwand

    The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour ).

  10. www.universetoday.com › 38040 › speed-of-light-2What is the Speed of Light? - Universe Today

    Sep 1, 2016 · Light travels at a constant speed of 1,079,252,848.8 (1.07 billion) km per hour. That works out to 299,792,458 m/s, or about 670,616,629 mph (miles per hour).