Exposition du systeme du monde was written as a non-mathematical introduction to Laplace's most important work Traité de Mécanique Céleste whose first volume appeared three years later. Laplace had already discovered the invariability of planetary mean motions.
Paglalahad du systeme du monde ay isinulat bilang isang non-matematiko pagpapakilala sa Laplace ang pinaka-mahalaga sa trabaho Traité de Mécanique Céleste na ang unang tatlong taon dami ng lumabas mamaya. Laplace ay natuklasan na ang kawalan ng pamplaneta ibig sabihin ng motions.