This was the first evidence of a physical relationship between gamma-ray bursts and supernovae.
Such cavities might be created by stellar winds and supernovae.
It may be that in elliptical galaxies such collisions are the major source of supernovae.
Well, for years, amateur astronomers have made important contributions to professional astronomy, spotting comets and supernovae, and monitoring exploding stars in distant galaxies.
This situation is met in the explosion of supernovae where the shock accelerates as it propagates through the less and less dense atmosphere of the supernova.
They are impact events, supernovae, volcanism and geomagnetic reversals that occur simultaneously with high solar activity.
They are probably associated with some supernovae, producing narrow beams of radiation during gravitational collapse.
Chapter 2 takes us further afield to examine how supernovae seed the elements of life into the interstellar medium.
