Stability of the Solar System is unlikely any of the planets will collide with each other or be ejected from the system in the next few billion years, and the Earth's orbit will be relatively stable. Since Newton's law of gravitation (1687), mathematicians and astronomers (such as Laplace, Lagrange, Gauss, Poincaré, Kolmogorov, Vladimir Arnold and Jürgen Moser) have searched for evidence for the stability of the planetary motions, and this quest led to many mathematical developments, and several successive 'proofs' of stability of the Solar System. The orbits of the planets are open to long-term variations. Modeling the Solar System is a case of the
The Planets the suite and that the movements on either side are in mirror images. Thus Mars involves motion and Neptune is static; Venus is sublime while Uranus is vulgar, and Mercury is light and "scherzando" while Saturn is heavy and plodding. This hypothesis is lent credence by the fact that the two outer movements, Mars and Neptune, are both written in rather unusual quintuple meter. Holst suffered neuritis in his right arm, which caused him to seek help from several amanuenses in scoring "The Planets". This is clear from the number of different hands apparent in the full score. Neptune was