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en.wikipedia.org/wiki/Electromagnetic_spectrum

For most of history, visible light was the only known part of the electromagnetic spectrum. The ancient Greeks recognized that light traveled in straight lines and studied some of its properties, including reflection and refraction. The study of light continued, and during the 16th and 17th centuries conflicting theories regarded ...

imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html

Are radio waves completely different physical objects than gamma-rays? They are produced in different processes and are detected in different ways, but they are not fundamentally different. Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation.

www.explainthatstuff.com/electromagnetic-spectrum.html

Mar 12, 2017 ... Light waves and other types of energy that radiate (travel out) from where they're produced are called electromagnetic radiation. Together, they make up what's known as the electromagnetic spectrum. Our eyes can see only a limited part of the electromagnetic spectrum—the colorful rainbow we see on ...

study.com/academy/lesson/the-7-major-regions-of-the-electromagnetic-spectrum.html

Infrared radiation is the next region on the electromagnetic spectrum. We call it infrared because it's just 'below' the red part of the visible spectrum. It spans from frequencies of about 300 gigahertz to about 400 terahertz. This is the same as a range of wavelengths from one millimeter to 750 nanometers. Infrared radiation is  ...

www.bbc.co.uk/schools/gcsebitesize/science/21c_pre_2011/radiation/electromagneticradiatonrev1.shtml

The pattern produced when white light shines through a prism is called the visible spectrum. The prism separates the mixture of colours in white light into the different colours red, orange, yellow, green, indigo and violet. In fact, visible light is only part of the electromagnetic spectrum. It's the part we can see.

www.pas.rochester.edu/~blackman/ast104/spectrum.html

The following table gives approximate wavelengths, frequencies, and energies for selected regions of the electromagnetic spectrum. ... The visible part of the spectrum may be subdivided according to color, with red at the long wavelength end and violet at the short wavelength end, as illustrated (schematically) in the ...

earthsky.org/space/what-is-the-electromagnetic-spectrum

Jun 5, 2017 ... The electromagnetic spectrum is all the wavelengths of light and reveals an otherwise invisible universe.

cmb.physics.wisc.edu/pub/tutorial/spectrum.html

What is electromagnetic radiation? The electromagnetic spectrum is a map of all the types of light that we can identify. It separates all the types of light by wavelength because that directly relates to how energetic the wave is. More energetic waves have shorter wavelengths while less energetic waves have longer ...

www.primalucelab.com/radioastronomy/blog/electromagnetic-spectrum-spettro-elettromagnetico

Jul 15, 2013 ... Is the world exactly as we see it? It is not so simple. For example, some animals, such as bees, can see parts of electromagnetic spectrum that we can not see ( such as ultraviolet light or infrared): the world does not appear to them as to us. Our eyes are in fact sensitive to wavelengths between 400 and 700 ...