700 million miles per hour). So, what is the speed of light Light is a universal speed limit and, according to einstein's theory of relativity, is the fastest speed in the universe
Molly Shen
300,000 kilometers per second (186,000 miles per second).
Speed of light, speed at which light waves propagate through different materials
In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second. 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. From the earliest experiments to the latest discoveries in cosmology and quantum mechanics, the speed of light remains the ultimate speed limit—an elegant, immutable boundary that continues to inspire wonder, challenge our intellect, and shape the very nature of reality.
The speed of light is a fundamental constant, approximately 299,792,458 meters per second It's the same for all observers and hasn't changed measurably over billions of years. Since 1983, the speed of light has been fixed by international agreement at 299,792,458 metres per second, mainly because the metre has been defined as the distance light travels in 1/299,792,458 seconds. Light travels at a constant, finite speed of 186,000 mi/sec
The speed of light in a vacuum is 299,792,458 metres/ second (though it is less in a transparent medium such as air, water or glass, depending on the refraction index).
