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The discovery of the first methane brown dwarf provides a framework fordescribing the important advances in both fundamental physics and astrophysicsthat are due to the study of companions of stars. I present a few highlights ofthe history of this subject along with details of the discovery of the browndwarf Gliese 229B. The nature of companions of stars is discussed with anattempt to avoid biases induced by anthropocentric nomenclature. With the newertypes of remote reconnaissance of nearby stars and their systems of companions,an exciting and perhaps even more profound set of contributions to science iswithin reach in the near future. This includes an exploration of the diversityof planets in the universe and perhaps soon the first solid evidence forbiological activity outside our Solar System.

Companions of Stars: From Other Stars to Brown Dwarfs to Planets: The Discovery of the First Methane Brown Dwarf