For 10 points, the collapse of a protostar leads to what form of "failed star"?
University of Arizona astronomers recently discovered an example of this object dubbed PZ Tel B. According to one theory based on a paper by Raup and Sepkoski, Oort cloud is disturbed periodically by a hypothetical example of this object, Nemesis. The presence of electron degeneracy pressure led Shiv Kumar to theorize this object, although Jill Tarter changed its name. It is distinguished from similar objects by the presence of (*) lithium, and Low surface temperature and methane were observed in its first confirmed example, Gliese 229B. With less than 84 Jupiter masses or 0.08 stellar mass, they are unable to perform hydrogen nuclear fusion but have higher density than planets. For 10 points, the collapse of a protostar leads to what form of "failed star"?
University of Arizona astronomers recently discovered an example of this object dubbed PZ Tel B.
brown dwarf