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visible light
Rayleigh Scattering: Why the Sky Is Blue and Sunsets Are Red
Rayleigh scattering is the elastic scattering of light by molecules smaller than its wavelength, explaining blue skies, red sunsets, and fiber-optic signal loss.
Electromagnetic Spectrum: Every Wavelength and Its Uses
The electromagnetic spectrum is the full range of electromagnetic radiation, from radio waves to gamma rays, with each region used in communication, medicine,...
Electromagnetic Spectrum: The Full Range of Light and Radiation
The electromagnetic spectrum is the full range of electromagnetic radiation, ordered by wavelength and frequency, from the longest radio waves to the shortest...
The Faint Glow Living Things Give Off, and What Color It Is
Biophotons are the faint visible glow all living things emit from metabolism. A 2025 study caught it in mice and watched it vanish...
