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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).
17. Mai 2023 · Learn what is the speed of light, how it is measured, and why it is a universal constant. Explore the history, theory and applications of light speed, and how it relates to the size and age of the universe.
8. Sept. 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. Its significance is far broader than its role in describing a property of electromagnetic waves.
- The Editors of Encyclopaedia Britannica
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 · Learn how fast light travels in a vacuum and how it can slow down in different media. Find out how the speed of light defines units of length and shapes astronomy.
Die Lichtgeschwindigkeit ( nach lat. celeritas: Schnelligkeit) ist eine fundamentale Naturkonstante. Sie trägt diesen Namen, weil sie in der Physikgeschichte erstmals als Geschwindigkeit des Lichts im Vakuum in Erscheinung trat. Ihr Wert ist ungefähr 300 000 km/s entsprechend 1,08 Mrd. km/h.
11. Apr. 2021 · Learn the definition, value, history, and implications of the speed of light, a constant that is exactly 299,792,458 meters per second. Find out why nothing can go faster than light and how space-time might be warped.
