In addition to his other accomplishments, William Herschel is also noted for his discovery that some stars do not merely lie along the same line of sight, but are also physical companions that form binary star systems.
Ud over hans andre bedrifter, er William Herschel også kendt for hans opdagelse af at nogle stjerner ikke bare ligger på den samme sigtelinje, men er fysiske dobbeltstjerner i form at binære stjernesystemer.