as⋅tron⋅o⋅phy [uh-stron-uh-fee] -noun 1.The play of physics in the universe, including the physical properties (luminosity, density, temperature, and chemical composition) of celestial objects such as galaxies, stars, planets, exoplanets, and the interstellar medium, as well as their interactions. 2. The casual study of matter, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies and phenomena. Astronophy © Paul Lohman 2010
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