EntityQ2088182· pop 9· linked from 59 articlesvisual binarySign in to savestar system where stars are sufficiently far apart then can be resolved into two starsConnectionsNewton's laws of motionEntityKepler's laws of planetary motionEntityabsolute magnitudeEntityInternational Standard Book NumberEntityInternational System of UnitsEntityaccelerationEntityastronomical unitEntityparsecEntitybinary starEntitycelestial sphereEntityArthur EddingtonEntityapparent magnitudeEntityparallaxEntityorbital periodEntityHertzsprung–Russell diagramEntitymain sequenceEntityluminosityEntitycenter of massEntityCambridge University PressEntityRobert Grant AitkenEntityCategoriesBinary stars