FACT CHECK #XFXZHLQR

WHAT WE FOUND

The speed of light in a vacuum is a fundamental physical constant officially defined as exactly 299,792,458 meters per second 126. This value corresponds to 299,792.458 kilometers per second 5. High-credibility sources confirm this constant was set by the Seventeenth General Congress on Weights and Measures in 1983 57. Because the exact value is 299,792.458 km/s, the claim that it is approximately 299,792 kilometers per second is factually correct 8. Other common approximations for this speed include 1.08 billion kilometers per hour or roughly 186,282 miles per second 39.

SOURCES

1. 1 · britannica.comACADEMIC
   Speed of light | Definition, Equation, Constant, & Facts | Britannica

   TIER A

2. 2 · astronomy.comACADEMIC
   Speed of light: How fast light travels, explained simply and clearly

   TIER A

3. 3 · en.wikipedia.orgWEB
   Speed of light - Wikipedia

   TIER B

4. 4 · space.comWEB
   What is the speed of light?

   TIER B

5. 5 · evidentscientific.comWEB
   Speed of Light in Microscopy | Light & Color Guide | Evident

   TIER B

6. 6 · lco.globalWEB
   The Speed of Light - Las Cumbres Observatory

   TIER B

7. 7 · physics.stackexchange.comWEB
   physical constants - Why is the speed of light exactly $299,792.458$ m/s and not faster or slower? - Physics Stack Exchange

   TIER B

8. 8 · brainly.inWEB
   The speed of light is approximately 299,792 kilometers per second. How many kilometers does light travel in - Brainly.in

   TIER B

9. 9 · universetoday.comWEB
   What is the Speed of Light? - Universe Today

   TIER B