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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).
Die Lichtgeschwindigkeit c {\displaystyle c} ist eine fundamentale Naturkonstante. Sie trägt diesen Namen, weil sie in der Physikgeschichte erstmals als Geschwindigkeit des Lichts im Vakuum in Erscheinung trat. Die Lichtgeschwindigkeit spielt eine zentrale Rolle in der speziellen und allgemeinen Relativitätstheorie und stellt einen ...
3. Apr. 2024 · Learn about the speed of light, a fundamental constant of nature that limits the speed of signals and material particles. Find out how the speed of light varies in different media and how it relates to mass and energy.
- The Editors of Encyclopaedia Britannica
17. Mai 2023 · The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light.
23. Jan. 2024 · Learn how the speed of light was first measured, why it is a constant and what it means for relativity. Explore the experiments, theories and discoveries that reveal the cosmic speed limit of the universe.
30. Mai 2023 · It takes 8 minutes for light from the sun to reach Earth, and a couple years for light from the other closest stars (like Proxima Centauri) to get to our planet.
16. Juli 2020 · We all know and love the speed of light, but why does it have the value that it does? Why isn't it some other number? And why did it become such a cornerstone of physics?
