companion star

noun

Astronomy.

1. companion.

Word History and Origins

Origin of companion star¹

First recorded in 1775–85

Example Sentences

The team believes that the cocoon's egg-like shape could be explained by either the star's shedding or by the influence of a yet-undiscovered companion star.

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In fact, nearly half of all stars similar to our sun have at least one companion star.

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This black hole was spotted in data from the European Space Agency's Gaia mission because it imposes an odd 'wobbling' motion on the companion star orbiting it.

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These observations revealed key properties of the companion star, which, together with Gaia data, allowed astronomers to precisely measure the mass of BH3.

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It was in this data pool that the researchers spotted the strange pattern of BH3's companion star.

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