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[[File:lighterstill.jpg]][[File:Orbital_degradation_model.jpg|right|frame]]
[[File:lighterstill.jpg]][[File:Orbital_degradation_model_small.jpg|right|frame]]
Lessons on the [[topic]] of '''''[[Catastrophism]]'''''.
Lessons on the [[topic]] of '''''[[Catastrophism]]'''''.
[[Category: Topics]]
[[Category: Topics]]
