binary galaxy

(bÿ -nă-ree, -nair-ee) Another name for physical double galaxy. See double galaxy.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

References in periodicals archive

At 83x this tight twosome is just an irregularly-shaped nebulosity, but 285x reveals a binary galaxy oriented northeast-southwest.

A fine field in bootes: this ragtag herd of galaxies is worth corralling

Franz Kahn and Lodewijk Woltjer realized this unexpected state of affairs in 1959 and made the bold suggestion that perhaps Andromeda and the Milky Way are in fact gravitationally bound, forming a binary galaxy system.

The great Milky Way Andromeda collision: in several billion years our home galaxy will collide with its nearest large neighbor, generating a spectacle unmatched in our corner of the universe

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