The difference between Triple star and Triple star system
When used as nouns, triple star means three stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields, whereas triple star system means a trinary star.
check bellow for the other definitions of Triple star and Triple star system
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Triple star as a noun (star):
Three stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields; a trinary star.
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Triple star as a noun (star):
Three stars that appear to be one when seen with the naked eye, either because they orbit one another (trinary stars) or happen to be in the same line of sight even though they are separated by a great distance.
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Triple star system as a noun (star):
a trinary star