click to view the MPEG movie (cliquez pour voir le film MPEG)

N-body problem integration (N=4: one star, one heavy planet and one light planet with a satellite) computed on three different computers (the Red one, the Green one and the Blue one: sensitivity to rounding-off errors) [Intégration du problème des N-corps (N=4: une étoile, une planète lourde et une planète légère avec un satellite) calculé sur trois ordinateurs différents (le Rouge, le Vert et le Bleu: sensibilité aux erreurs d'arrondi)].




Let's start the program on the computers with the same initial conditions. Devastating differences again appear. At first, the three computers give the same values, and the superposed bodies appear white. Unfortunately, this does not last long: slowly and then faster and faster, the the predictions of the three computers become absolutely different: the Red computer forecasts the ejection of a body, but not the other two.

Let's N-body problem integration (N=4: one star, one heavy planet and one light planet with a satellite)computed on three different computers (the Red one, the Green one and the Blue one: sensitivity to rounding-off errors) see it again, highlighting one of the bodies.


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