The Block (album) has a single, which was released on May 13, 2008.
Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars , of approximately 13 to 75 -- 80 Jupiter masses , or approximately to about .. gas giant. gas giant. Below this range are the sub-brown dwarfs , and above it are the lightest red dwarfs -LRB- M9 V -RRB- .. Brown dwarfs may be fully convective , with no layers or chemical differentiation by depth .. convective. convective. Unlike the stars in the main-sequence , brown dwarfs are not massive enough to sustain nuclear fusion of ordinary hydrogen -LRB- 1H -RRB- to helium in their cores .. main-sequence. main sequence. nuclear fusion. nuclear fusion. hydrogen. hydrogen. They are , however , thought to fuse deuterium -LRB- 2H -RRB- and to fuse lithium -LRB- 7Li -RRB- if their mass is above a debated threshold of and , respectively .. fuse deuterium. deuterium burning. fuse lithium. lithium burning. It is also debated whether brown dwarfs would be better defined by their formation processes rather than by their supposed nuclear fusion reactions .. nuclear fusion. nuclear fusion. Stars are categorized by spectral class , with brown dwarfs designated as types M , L , T , and Y. Despite their name , brown dwarfs are of different colors .. spectral class. spectral classification. Many brown dwarfs would likely appear magenta to the human eye , or possibly orange / red .. magenta. magenta. Brown dwarfs are not very luminous at visible wavelengths .. Planets are known to orbit some brown dwarfs  : 2M1207b , MOA-2007-BLG-192Lb , and 2MASS J044144b .. 2M1207b. 2M1207b. MOA-2007-BLG-192Lb. MOA-2007-BLG-192Lb. 2MASS J044144b. 2MASS J044144b. At a distance of about 6.5 light years , the nearest known brown dwarf is Luhman 16 , a binary system of brown dwarfs discovered in 2013 .. Luhman 16. Luhman 16. DENIS-P J082303.1-491201 b is listed as the most-massive known exoplanet -LRB- as of March 2014 -RRB- in NASA 's exoplanet archive , despite having a mass more than twice the 13-Jupiter-mass cutoff between planets and brown dwarfs .. DENIS-P J082303.1-491201 b. DENIS-P J082303.1-491201 b. the most-massive known exoplanet. List of exoplanet extremes#Planetary characteristics