![]() The image above shows the amount of atmospheric ozone in Dobson Units-the common unit for measuring ozone concentration. The Dutch Ozone Monitoring Instrument (OMI) onboard NASA's Aura satellite measures amounts of trace gases important to ozone chemistry and air quality. Each year, a "hole" of thinning atmospheric ozone expands over Antarctica, sometimes extending over populated areas of South America and exposing them to increased levels of harmful UV rays. ![]() This image from NASA's Galaxy Evolution Explorer (GALEX) spacecraft reveals new young stars in the spiral arms of galaxy M81.Ĭhemical processes in the upper atmosphere can affect the amount of atmospheric ozone that shields life at the surface from most of the Sun's harmful UV radiation. Scientists can study the formation of stars in ultraviolet since young stars shine most of their light at these wavelengths. Since the Earth's atmosphere absorbs much of the high-energy ultraviolet radiation, scientists use data from satellites positioned above the atmosphere, in orbit around the Earth, to sense UV radiation coming from our Sun and other astronomical objects. Sure enough, the paper turned black, proving the existence of ultraviolet light. Knowing that photographic paper would turn black more rapidly in blue light than in red light, he exposed the paper to light beyond violet. In 1801, Johann Ritter conducted an experiment to investigate the existence of energy beyond the violet end of the visible spectrum. Johann Ritter's experiment was designed toexpose photographic paper to light just beyondthe visible spectrum and prove the existenceof light beyond violet-ultraviolet light.Credit: Troy Benesch DISCOVERY OF ULTRAVIOLET
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