unseen companion star

noun

Definition of unseen companion star

: a member of a binary or multiple star system that is known to exist only by its gravitational effect on the visible components whose apparent motions it usually alters in a cyclic manner

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“Unseen companion star.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unseen%20companion%20star. Accessed 5 Dec. 2020.

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