Heliosphere

The moon is often contrasted with the sun: see St Francis' Canticle of the Creatures ("Brother Sun, Sister Moon"), Greek mythology (siblings Selene and Helios), innumerable popular songs (like Paul Revere and the Raiders' "Mr. Sun, Mr. Moon"). And now, the pedigree of Exomoon (GB) (Invincible Spirit {Ire}), a fighting  3-year-old winner of a competitive maiden at Clairefontaine last Monday. An "exomoon" is a natural satellite that orbits an exoplanet, that is: a planet outside the solar system. This tenacious colt's dam (who also has a 2-year-old filly called New...