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Related to double star: Optical double star
See binary star.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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two stars that appear together in the sky and appear as one to the eye or through a low-power telescope.
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|Noun||1.||double star - a system of two stars that revolve around each other under their mutual gravitation|
star - (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
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