It wasn't until the 1970s that chemists learned that CFCs break into chlorine atoms when exposed to intense UV light from the sun. A chlorine atom can react with ozone to form an oxygen molecule (O2) ...

The best outdoor shades help create a relaxing outdoor retreat. Improve lighting, control temperature, and provide privacy ...

A sun rash — known medically as a polymorphic light eruption — is a skin reaction ... skin reaction to a substance in combination with UV rays. A common substance that may also cause ...

In the vast time it takes this light to reach Earth, the expansion of the Universe stretches its wavelength. The relatively short-wavelength UV light produced ... that of the Sun when the Universe ...