Astronomy Picture of the Day . A Lonely Neutron Star . ... Credit: F. Walter ( SUNY Stony Brook ), WFPC2 , HST , NASA Explanation: How massive can a star get without imploding into a black hole? ... Assuming that the object is a neutron star of typical mass, some previous theories of neutron star structure would have predicted an implosion that would have created a black hole . ... Publications with keywords: black hole - neutron star . Publications with words: black hole - neutron star . ...