The Sun Emits Not Only Visible Light

The sun, like all stars, produces a variety of electromagnetic radiation. Our eyes can only discern a limited portion of colors, from 380 nm (purple) to 740 nm (red). If you increase the wavelength further, you first enter the realm of infrared light and subsequently reach radio waves.

When the wavelength shortens, ultraviolet light is the first to appear, most of which is absorbed by the atmosphere and leaves us with a tan, followed by X-rays and eventually gamma radiation.

The Sun emits these frequencies at a range of intensities. Additionally, some invisible spectral regions can teach us more about our luminary than visible light does. As a result, many of the space and terrestrial instruments that observe our star do so in "colors" that are beyond the range of the human eye.