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A planet spirals away in a simulation

An orbit uses explicit Euler: position += velocity × dt, then velocity += acceleration × dt, both using old values. The orbit slowly grows. What is a simple, stable fix?

A.Halve the planet's mass each frame to slow the driftB.Update velocity first, then position with the new velocityC.Use a larger dt so fewer error steps build upD.Round positions to whole pixels at the end of each frame

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A planet spirals away in a simulation

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