Methane Dwarf . ... The moniker "methane dwarf" was derived from the strong signature of methane gas in the object's spectrum . Along with the red color, the presence of methane (CH4) indicates that this object is cool - cooler than brown dwarfs which lack the strong methane signature yet are the only other known objects in this mass range . ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ... A service of: LHEA at NASA / GSFC . ...