Solar System 7 light-years away. Compared to many other planetary systems, the Solar System stands out in lacking planets interior to the orbit of Mercury. The known Solar System also lacks super-Earths (Planet Nine could be a super-Earth beyond the known Solar System). Uncommonly, it has only small rocky planets and large gas giants; elsewhere planets of intermediate size are typical—both rocky and gas—so there is no "gap" as seen between the size of Earth and of Neptune (with a radius 3.8 times as large). Also, these super-Earths have closer orbits than Mercury. This led to hypothesis that all planetary systems start
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