Pre-supernova stars may show signs of instability for months before the big explosion, spewing material into space and creating a dense gas shell around themselves, report scientists in a new report. In the most common type of supernova, the iron core of a massive star suddenly collapses in on itself and the outer layers are thrown out into space in a spectacular explosion. New research led by Weizmann Institute of Science researchers shows that the stars that become core-collapse supernovae might already exhibit instability for several months before the big event, spewing material into space and creating a dense gas shell around themselves...
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