by Brown dwarfs, also known as "coffee colored dwarfs" or "failed stars" are the natural link between stars and planets.
They are more massive than Jupiter but now sufficiently to burn hydrogen, which is the fuel the stars use to shine.
For that reason these substellar objects were not observed until observers detected them in the mid 1990's.
They are particularly interesting because it was predicted that some of them could preserve intact their content of lithium, sometimes known as "white petroleum" because of its rarity and its relevance.
Source
They are more massive than Jupiter but now sufficiently to burn hydrogen, which is the fuel the stars use to shine.
For that reason these substellar objects were not observed until observers detected them in the mid 1990's.
They are particularly interesting because it was predicted that some of them could preserve intact their content of lithium, sometimes known as "white petroleum" because of its rarity and its relevance.
Source
