binary galaxy

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.
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.