Astronomy refers to a field of science that deals with celestial objects, space as well as the physical universe as a whole. Examples of celestial objects include stars, planets, galaxies, comets and nebulae.
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what does astronomy mean
the science that deals with the material universe beyond the earth's atmosphere.
In mathematics and statistics, the arithmetic mean , or simply the mean or average when the context is clear, is the sum of a collection of numbers divided by the number of numbers in the collection....