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FRom what the article I read said, binaries are quite common in Comets, about 30% or so.
Could be it's a factor in that these things are dirty snowballs and collections of rubble so prone to fracture and seperation. Microgravity keeps them 'together' so you get a flying heap of rocks. This one could break up further or seperate as it goes round the sun just like a previous recent visitor.
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