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 scherzo movement of a projected symphony, contains features characteristic of much of Holst's earlier music—"a summing up of Holst's orchestral art", according to Short. Dickinson suggests that the somewhat casual collection of material in the work gives little indication of the symphony that might have been written. Holst made some recordings, conducting his own music. For the Columbia company he recorded "Beni Mora", the "Marching Song" and the complete "Planets" with the London Symphony Orchestra (LSO) in 1922, using the acoustic process. The limitations of early recording prevented the gradual fade-out of women's voices at the end of "Neptune", and