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image of the Cygnus Loop nebula could not have been taken from the floor of the Earth because the ozone layer blocks the extremely-violet radiation emitted by the nebula.Ozone in the Earth’s stratosphere is created by ultraviolet gentle placing abnormal oxygen molecules containing two oxygen atoms (O2), splitting them into particular person oxygen atoms (atomic oxygen); the atomic oxygen then combines with unbroken O2 to create ozone, O3. The ozone molecule is unstable (though, in the stratosphere, lengthy-lived) and when ultraviolet light hits ozone it splits right into a molecule of O2 and a person atom of oxygen, a continuing process referred to as the ozone-oxygen cycle Chemically, this may be described as:

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