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wikipedia.org

https://en.wikipedia.org/wiki/Light

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 electric lights and power systems, electric lighting has effectively replaced firelight.

britannica.com

https://www.britannica.com/science/light

Light | Definition, Properties, Physics, Characteristics, Types ...

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 less than about 1 × 10 −11 metres to radio waves measured in metres.

merriam-webster.com

https://www.merriam-webster.com/dictionary/light

LIGHT Definition & Meaning - Merriam-Webster

The meaning of LIGHT is something that makes vision possible. How to use light in a sentence. Synonym Discussion of Light.

howstuffworks.com

https://science.howstuffworks.com/light.htm

How Light Works - HowStuffWorks

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 disjointed.

learn-physics.org

https://learn-physics.org/light/

Light - Learn Physics

Light is a type of energy that enables us to see with our eyes. Light travels from a source, like the sun or a light bulb, to our eyes, and to the surroundings. That is the reason we can see objects during daytime with the sunlight, or with a light bulb in the night.

skyatnightmagazine.com

https://www.skyatnightmagazine.com/space-science/w…

What is light? | BBC Sky at Night Magazine

What is light, what are the different types of light and how does light behave? A history of discoveries has led us to see more clearly.

thefreedictionary.com

https://www.thefreedictionary.com/light

Light - definition of light by The Free Dictionary

Define light. light synonyms, light pronunciation, light translation, English dictionary definition of light. n. 1. Physics a. Electromagnetic radiation that is visible, perceivable by the normal human eye as colors between red and violet, having frequencies between...

lco.global

https://lco.global/spacebook/light/what-is-light/

What is Light? - Las Cumbres Observatory

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 centimeters to over 100 meters are called radio waves.

sciencefocus.com

https://www.sciencefocus.com/science/what-is-light

What is light? A guide to waves, particles, colour and more

Is light a wave or a particle? How is it created? And why can’t humans see the whole spectrum of light? All your questions answered.

harvard.edu

https://news.harvard.edu/gazette/story/2025/12/nig…

Nighttime exposure to light may raise cardiovascular risk by up to 50%

Exposure to light at night raises cardiovascular disease risk by up to 50 percent over sleeping in the dark, new research shows. But scientists say the effect isn’t from lack of sleep, but from disruption of the body’s master biological clock, the circadian rhythm. Angus Burns, a postdoctoral fellow at Harvard Medical School and Brigham and Women’s Hospital, said the work highlights the ...