With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Dark Half is based on a 1989 novel.
text_B: Comet dust refers to cosmic dust that originates from a comet .. cosmic dust. cosmic dust. comet. comet. Comet dust can provide clues to comets ' origin .. When the Earth passes through a comet dust trail , it can produce a meteor shower .. comet. comet. Earth. Earth. meteor shower. meteor shower
not_related.