As a result, the Sun will expand and turn into a giant red star, swallowing its inner planets. At some point, the fusion process in the core will slow down and the star will collapse on itself and then explode. We know this from the study of star evolution which is reflected in the presence of many different kinds of stars in our neighborhood, within the Milky Way. As you know, the Sun is the main source of energy for the Earth. The Earth receives energy from the Sun in a number of forms, mainly as visible light.
Light represents electromagnetic waves of a certain wave length.
We cannot see or feel UV, but some insects, like bees, have special systems that allow them to perceive it. UV light, however, does provide humans with Vitamin D, which is essential to our overall health and well-being. Without it, our bodies would not be able to properly absorb calcium for use in bone production. Vitamin D is produced within the fatty layers below the skin when UV rays from the Sun enter them. Unfortunately, prolonged exposure to UV light is known to cause skin damage and also cancer.