![]() The region thus affected is referred to as the ionosphere. Many of these pieces are electrically charged (any broken-up atoms, and many molecular fragments), so the gas at high altitudes consists to a great extent of ions, or charged particles. In the upper reaches of a planet's atmosphere (the exosphere and mesosphere) ultraviolet radiation from the Sun easily penetrates the thin (low-density) gases, is absorbed by the atoms and molecules which make up these gases, and in the process breaks them down into smaller pieces. ![]() Review of the Structure of the Outer Atmosphere
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