Isaac Newton discovered that light is composed of a spectrum of colors when passed through a prism, and that white light is actually made up of different colors. He also proposed that light behaves as particles called "corpuscles" or photons.
Sir Isaac Newton
The light year was not discovered. It was made up, by people who kept coming up with distances like [ 25,866,280,000,000 miles ] in their work, and soon realized that they were going to need something bigger than a mile, so they invented the light-year.
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The discovery that light is made up of seven colors was credited to Sir Isaac Newton. He demonstrated this by passing sunlight through a prism and observing the separation of the light into its component colors, creating a rainbow spectrum.
Light was not "discovered" in the traditional sense. It has always existed in the universe. However, humans have studied and understood light through experiments and observations over time. Scientists like Isaac Newton and Albert Einstein made contributions to our understanding of light through their research and theories.
The light year was not discovered. It was made up, by people who kept coming up with distances like [ 25,866,280,000,000 miles ] in their work, and soon realized that they were going to need something bigger than a mile, so they invented the light-year.
Isaac Newton was the scientist who discovered that light is made up of different wavelengths when he conducted experiments with prisms. He found that white light could be separated into a spectrum of colors.
Sir W. Crookes discovered the Properties of Light in 1879.
UV Light was discovered by Johann Wilhelm Ritter, in 1801
Sir Frederick William Herschel discovered infrared light in an experiment to measure the temperature of different frequencies of light.
The neutrino was recently discovered to have a velocity greater than that of light in a vacuum. This discovery was made in experiments such as OPERA where neutrinos were observed traveling faster than the speed of light, although those results were later retracted.