double-star

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Englisch - Englisch
Two stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields; a binary star
Two stars that appear to be one when seen with the naked eye, either because they orbit one another (binary stars) or happen to be in the same line of sight even though they are separated by a great distance (optical binaries)
double star system
a binary star
double star systems
plural form of double star system