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| YORP: Yarkovsky-O'Keefe-Radzievskii-Paddack effect (The Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect involves solar energy heating the body in question. As the asteroid rotates, the ‘hot spot' re-radiates the energy in a specific direction relative to its spin axis, and this can cause it to spin up over time. AllaR) | |||