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Although P/2019 LD2 (Atlas) and 121725 Aphidas are both classified as centaur objects—outer solar system bodies in unstable orbits—they exhibit striking differences in _____ object P/2019 LD2 (Atlas) is considered an active centaur, showing sporadic comet-like activity (such as clouds of dust and gas on its surface), 121725 Aphidas, showing no such activity, is considered dormant.