Astronomy Picture of the Day . ... Like a ship plowing through the interstellar medium , runaway star HD 77581 has produced this graceful arcing bow wave or "bow shock" - compressing the gaseous material in its path. ... This pulsar is clearly the remnant of a supernova explosion ... which seems to have given this massive star and its companion a mighty kick ! ... Publications with keywords: pulsar - runaway star - supernova . Publications with words: pulsar - runaway star - supernova . ...