... Credit Copyright: C. Barbieri (Univ. of Padua), NASA , ESA Explanation: A dim double star system cataloged as Gliese 623 lies 25 light-years from Earth, in the constellation of Hercules . ... The present estimates of the mass of Gliese 623b are right at this red dwarf/brown dwarf border but future observations should help clarify the nature of one of our Galaxy's small stars. ... Publications with keywords: brown dwarf - nearby stars - binary star . ... The Case of the Very Dusty Binary Star . ...