The scientific study of the Earth's upper atmosphere, including its chemical composition, physical properties, and interactions with solar radiation.
From aero- (air) + -nomy (laws or principles governing something). The term was established in the mid-20th century to distinguish the study of the upper atmosphere from meteorology.
Aeronomy is the science that explains why auroras dance in the sky and how solar winds shape our magnetosphere—it's where physics, chemistry, and space science collide at the edge of our world.
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