The origins of unusual knots of gas and dust found in planetary nebulas, such as the Ring Nebula, the Dumbbell Nebula, and NGC 2392, were not initially predicted and remain poorly understood.
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The origins of unusual knots of gas and dust found in planetary nebulas, such as the Ring Nebula, the Dumbbell Nebula, and NGC 2392, were not initially predicted and remain poorly understood.
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