Astronomy meaning

ə-strŏnə-mē
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The definition of astronomy is the scientific study of matter outside of the atmosphere of the Earth including stars, planets and what they are made of and how they move.

Someone who examines moon rocks to determine their composition is an example of someone who engages in astronomy.

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The scientific study of matter and phenomena in the universe, especially in outer space, including the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial objects.
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The science of the universe in which the stars, planets, etc. are studied, including their origins, evolution, composition, motions, relative positions, sizes, etc.
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A system of knowledge or beliefs about celestial phenomena.

The various astronomies of ancient civilizations.

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The scientific study of the universe and the objects in it, including stars, planets, nebulae, and galaxies. Astronomy deals with the position, size, motion, composition, energy, and evolution of celestial objects. Astronomers analyze not only visible light but also radio waves, x-rays, and other ranges of radiation that come from sources outside the Earth's atmosphere.
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The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe.
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A book or treatise on this.
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Origin of astronomy

  • Middle English astronomie from Old French from Latin astronomia from Greek astronomiā astro- astro- -nomiā -nomy

    From American Heritage Dictionary of the English Language, 5th Edition

  • Old French astronomie, from Latin astronomia, from Ancient Greek ἀστρονομία (astronomia), from ἄστρον (astron, “star”), from Proto-Indo-European *h₂stḗr (“star”) + νόμος (nomos, “arranging, regulating”), related to νέμω (nemō, “I deal out”).

    From Wiktionary