Physical Double Star

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Physical Double Star

</dt>
Two stars in nearly the same line of sight and at approximately the same distance from the observer, as distinguished from an optical double star (two stars in nearly the same line of sight but differing greatly in distance from the observer). </dd>
If the stars revolve about their common center of mass, they are called a binary star. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use