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Although 39P/Oterma and 83982 Crantor are both classified as centaur objects—outer solar system bodies in unstable orbits—they exhibit striking differences in _____ object 39P/Oterma is considered an active centaur, showing sporadic comet-like activity (such as clouds of dust and gas on its surface), 83982 Crantor, showing no such activity, is considered dormant.