Some MACHOs may be neutron stars left behind after supernovae explosions, but most are thought to be
tiny failed stars called brown dwarfs which have a mass of less than 8 per cent that of the Sun and are too small to sustain nuclear fusion reactions.
This feels like the film - version of I Am Legend that filmmakers have struggled with at least three times and all
failed in somewhat interesting ways (The best of which, The Last Man On Earth,
starred Vincent Prince struggling with a very
tiny European budget).