Light Travels at About 299,792 Kilometers per Second
Nothing with mass can reach that speed in a vacuum.
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Sunlight Takes Thousands of Years to Escape the Sun's Core
Estimates range from about 10,000 to 170,000 years, before the light takes only eight minutes to reach Earth.
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Blue Light Scatters More, Making the Sky Look Blue
The effect is known as Rayleigh scattering.
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Light Behaves as Both a Wave and a Particle
This wave-particle duality is central to quantum physics.
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Visible Light Is a Tiny Slice of the Electromagnetic Spectrum
Radio waves, X-rays and gamma rays are all forms of light that human eyes can't see.