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Ozone layer

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The ozone layer was that part of a planet's atmosphere which contained higher than usual concentrations of ozone. Even the small concentrations of ozone presented in the ozone layer were vital to life on most planets because of the particle's ability to block ultraviolet radiation, which could be harmful to biological life.

The ozone layer of Earth suffered severe damage during the 20th century and by the 21st century had been nearly destroyed.

The planet Aldea suffered damage to its ozone layer from the long-term use of its planetary defense system. The resulting radiation poisoning rendered the Aldeans sterile and threatened to destroy their civilization. (TNG: "When The Bough Breaks")

A similar fate faced the Klingon homeworld of Qo'noS when the moon Praxis exploded, damaging their ozone layer. (Star Trek VI: The Undiscovered Country)

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