Given that 5.5 micrograms of the vitamin are estimated to ingested daily through food, ultraviolet rays from the sun are required to provide the other necessary 10 micrograms of vitamin D.

Cosmic rays are particles from outer space that travel across the universe. They can be made by the sun, by other stars exploding, and even black holes. They move extremely fast, nearly the speed of ...

Here are five facts that will help you be safer in the sun. UV rays are not all the same. When we talk about sun exposure, what we really mean is exposure to ultraviolet (UV) radiation. UV-A and UV-B ...