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In fact , the purpose of this deployment would have been to hunt down armed PKK remnants that withdrew into northern Iraq when the PKK dissolved itself in the late 1990s and then re-formed itself as KADEK , focusing on social action in Turkey rather than armed struggle . In your answer be sure to state the ( approximate ) composition of the material returned to space , and the kind of star or stellar remnant that is left after each event . Note that when we say these stars have " come and gone ; ' usually that means only that they have been transformed into a " dead " remnant that no longer feeds on nuclear energy . The source of the radiation might be a previously unknown stellar remnant that is a binary companion to the star that exploded in 1987 . The patches of prairie remaining are mostly small remnants that were too steep or rocky to be plowed .