... 13th of March, during the course of his systematicsweeping of the sky, Herschel noted the appearance of an unusual‘‘nebulous star.’’ The star seemed uncommonly large, and he sus-pected it of ... cluster are, of course,themselves very distant clusters of stars, and the globular clustersconsist of stars, but some of the nebulae he described are cloudy,truly gaseous objects in our own galaxy. ... telescopes,pushing the limits of what could be accomplished with reflectorsin the pursuit of faint or nebulous sources of light. Alexanderand Caroline provided essential support in this extension of hisalready...