The main source of natural light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of …

Feb 5, 2026 · Light is electromagnetic radiation that can be detected by the human eye. Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths …

But what exactly is light? We catch glimpses of its nature when a sunbeam angles through a dust-filled room, when a rainbow appears after a storm or when a drinking straw in a glass of water looks …

LIGHT definition: something that makes things visible or affords illumination. See examples of light used in a sentence.

Light in physics, its properties, colours, and behaviour, including reflection, refraction, and optics explained clearly.

Light is just one form of electromagnetic radiation, or electromagnetic waves. These waves are all around us and come in many sizes. The largest electromagnetic waves, with wavelengths from a few …

Light is a name we give to electromagnetic radiation that we can see with our eyes. Often, the term is used a little more broadly, to include electromagnetic radiation that is just outside the range we can …

Dec 1, 2025 · Light is a vital form of energy that makes vision possible and supports life on Earth. It travels as electromagnetic waves and also behaves like tiny particles called photons.

Jul 2, 2025 · Light, as both a wave and a particle, is a fundamental aspect of the universe and a powerful tool in modern technology. From optical communications and imaging to lasers and energy …

Light facts for kids In empty space, light moves incredibly fast. This speed is called the speed of light, which is about 299,792,458 meters (or 186,282 miles) every second. This means it takes about 8 …