ultraviolet radiation/rays• It allows an insomniac who can not get exposure to sunlight to still benefit from the regulatingeffects of ultraviolet rays.• Large areas, including the United States, continue to get increasingly harmful ultraviolet radiation.• The satellite, called Astron, is intended to studyultraviolet radiation and X-rays from celestial objects.• High up in the sky was a protective layer of gas that screened out dangerousultraviolet rays from the sun.• But because ultraviolet radiation is a constantfeature of solar radiation, the ozone layer is maintained.• The thermal tide may also be responsible for dim ultraviolet radiation observed to come from the middle of the night hemisphere.• They helpdeplete the ozone layer, allowing ultraviolet rays to causedeadly skin cancers.• If ozone deterioration persisted, they warned, solar ultraviolet radiation would flood Earth.