Light, what is it? Many people think "Oh; well light is what makes it not dark." Light is more than just a phenomenon that puts darkness to shame. According to Webster's Dictionary light is "An electromagnetic radiation that can be seen to the naked eye." That definition doesn't help very much. Light is a force that makes everything we see have color. Light reflects off of certain colors to make us see colors. Light is used to learn about distant things, such as stars. When light is used to identify and classify star types it is called spectral classification. Some commonly asked questions about light are: what is light spectra, who found light spectra, how is light spectra used to classify stars, how is light spectra measured, and what is used to measure light spectra"

"What is light spectra"" You might ask yourself. Light spectra is the system...