21. This will be sufficient to unbind the star in a cataclysmic, Type Ia supernova explosion . 22. Current theories fail to explain how such speeds can be attained from a supernova explosion . 23. Reines had prepared for the possibility of measuring the distant events of a supernova explosion . 24. Iron core collapse may produce a supernova explosion , and sometimes a gamma-ray burst ( GRB ). 25. Pulsars are rapidly rotating, highly magnetized neutron stars formed during the supernova explosions of massive stars. 26. Other nebulae form as the result of supernova explosions ; the death throes of massive, short-lived stars. 27. :A neutrinosphere is a transient region within a supernova explosion where neutrinos exist in thermal equilibrium. 28. The heavier elements from oxygen to iron are primarily produced by supernova explosions within the galaxy. 29. The region is a firestorm of raw stellar creation, perhaps triggered by a nearby supernova explosion . 30. Their source is likely to be supernova explosions .
