Pair of stars in orbit around a common centre of gravity. Their relative sizes and brightnesses and the distance between them vary widely. Perhaps half of all stars in the Milky Way Galaxy are binaries or members of more complex multiple systems. Some binaries form a class of variable stars (see eclipsing variable star). Stars can be identified as binaries in various ways—visually by telescope, through spectroscopic observation, by changes in apparent brightness (when the dimmer star eclipses its companion), or by changes in the proper motion of the visible member (owing to the gravitational pull of the invisible companion).
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Double Star reorganizing Dongfeng to fulfil its tire dream.(Qingdao Double Star Group signs asset trusteeship agreement with Dongfeng (Shiyan) Tire Company Ltd. and Dongfeng Tire Factory Industrial Development Company Ltd.)
Apr 06, 2005; On March 19, Qingdao Double Star Group proclaimed that it had signed asset trusteeship agreement with Dongfeng (Shiyan) Tire Co.,...
Double Star involves in regrouping of Dongfeng Tire.(Qingdao Doublestar Group Co. signs agreement with Hubei Dongfeng Tire Group Corp.)
Apr 06, 2005; Now Double Star Group has got involved in the regrouping of Hubei Dongfeng Tire Group Corporation (Dongfeng Tire). Reporters...