Brown dwarf

A brown dwarf is a stellar object that has a mass between the most massive gas giant planets and the least massive stars, approximately 13 to 80 times that of Jupiter. Brown dwarfs do not acquire enough mass to trigger sustained nuclear fusion of hydrogen into helium in their cores and are referred to as failed stars. For this reason they are prime candidates for stellification.

A brown dwarf called The Accident has been careening through the Milky Way for at least 10 billion years.