Planet the Sun: Jupiter is the largest, at 318 Earth masses, whereas Mercury is the smallest, at 0.055 Earth masses. The planets of the Solar System can be divided into categories based on their composition: An exoplanet (extrasolar planet) is a planet outside the Solar System. In early 1992, radio astronomers Aleksander Wolszczan and Dale Frail announced the discovery of two planets orbiting the pulsar PSR 1257+12. This discovery was confirmed, and is generally considered to be the first definitive detection of exoplanets. These pulsar planets are believed to have formed from the unusual remnants of the supernova that produced the
Gustav Holst wrath. In 1912 Holst composed two psalm settings, in which he experimented with plainsong; the same year saw the enduringly popular "St Paul's Suite" (a "gay but retrogressive" piece according to Dickinson), and the failure of his large scale orchestral work "Phantastes". Holst conceived the idea of "The Planets" in 1913, partly as a result of his interest in astrology, and also from his determination, despite the failure of "Phantastes", to produce a large-scale orchestral work. The chosen format may have been influenced by Schoenberg's "Fünf Orchesterstücke", and shares something of the aesthetic, Matthews suggests, of Debussy's "Nocturnes" or "La