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      • Light-speed is the rate that light travels through empty space (a vacuum), which is about 3.0 × 10 8 m/s or 3.0 × 10 5 km/s. It is represented by the symbol c, and measurements show it to be constant—it does not change, regardless of the state of motion of either its source or the one measuring it.

      4.1: Relationship Between Distance, Speed, and Time

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  3. www.livescience.com › 29111-speed-of-light-notSpeed of Light May Not Be Constant, Physicists Say

    Apr 27, 2013 · The speed of light is constant, or so textbooks say. But some scientists are exploring the possibility that this cosmic speed limit changes, a consequence of the nature of the vacuum of space.

  4. 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).

  5. 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...

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

    Jan 23, 2024 · Observations of the cosmic microwave background, the light released when the universe was 380,000 years old, show that the speed of light hasn’t measurably changed in over 13.8 billion years....

  8. www.bbc.co.uk › bitesize › articlesLight Waves - BBC Bitesize

    The greater the change of speed of light at a boundary, the greater the refraction. Light is bent more by glass than by water because glass is denser than water and so slows it down more.

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  9. www.bbc.co.uk › bitesize › guidesSpecial relativity - Special relativity - Higher ... - BBC

    The speed of light is constant but length and time can change when objects travel at close to the speed of light. These changes depend on the relative motion of the observer and the...

  10. www.sciencealert.com › why-is-the-speed-of-lightPhysics Explained: Here's Why The Speed of Light Is The Speed ...

    Apr 12, 2017 · Today the speed of light, or c as it's commonly known, is considered the cornerstone of special relativity – unlike space and time, the speed of light is constant, independent of the observer. What's more, this constant underpins much of what we understand about the Universe.

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