Observations by the MACHO collaboration suggest that a significant proportion of the galactic halo dark matter is in the form of compact objects with typical masses M ∼ 0.5M⊙. One of the current mysteries is the nature and origin of these objects. We suggest that these objects are stars composed of mirror matter. This interpretation provides a plausible explanation for the inferred masses and abundance of the MA-CHO events. We also comment on the possibility of inferring the existence of mirror supernova’s by detecting the neutrino burst in existing underground detectors such as SuperKamiokande.