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Answer for the clue "Study of phenomena on high ", 8 letters:
aeronomy

Word definitions for aeronomy in dictionaries

Wikipedia Word definitions in Wikipedia
Aeronomy is the meteorological science of the upper region of the Earth's or other planetary atmospheres , which relates to the atmospheric motions, its chemical composition and properties, and the reaction to it from the environment from space. The term ...

Wiktionary Word definitions in Wiktionary
n. A branch of science that deals with the upper atmosphere of the Earth and the other planets with reference to their chemical composition, physical properties, relative motion, and responses to radiation from space.