Substellar objects are celestial bodies that have characteristics intermediate between stars and planets. They include brown dwarfs, which are failed stars that do not have enough mass to sustain nuclear fusion in their cores, as well as free-floating planets, which are planets that do not orbit any star. Research in the field of substellar objects focuses on studying their properties, formation mechanisms, and evolution. This includes understanding their atmospheres, magnetic fields, and internal structures. Scientists also study the population of substellar objects in our galaxy and beyond, as well as their potential role in the formation and evolution of planetary systems. Overall, research on substellar objects plays a crucial role in expanding our understanding of the diversity of celestial bodies in the universe and in shedding light on the processes that govern their existence and behavior.