astrodynamics

astrodynamics

[as-troh-dahy-nam-iks]
noun (used with a singular verb)
the science dealing with the paths of space vehicles.

Origin:
1950–55; astro- + dynamics

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Collins
World English Dictionary
astrodynamics (ˌæstrəʊdaɪˈnæmɪks)
 
n
(functioning as singular) the study of the motion of natural and artificial bodies in space

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
astrodynamics   (ās'trō-dī-nām'ĭks)  Pronunciation Key 
The dynamics of natural and artificial bodies in outer space.
The American Heritage® Science Dictionary
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