A thin ozone layer on scorching Venus

Science Daily– We knew Mars had an ozone layer, and now we’ve discovered that Venus has an ozone layer, too.  However, while most of the Earth’s ozone is made from oxygen molecules produced by photosynthesizing organisms, Mars and Venus get their ozone a different way.  On those lifeless (?) planets, ultraviolet light breaks down CO2 into both carbon and oxygen molecules, and the oxygen molecules get turned into ozone.

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