Supernovaexplosionisapeculiarastronomicalphenomenon,whichhasarousedgreatinterestandextensiveresearchbyastronomers.Atpresent,however,itiserroneouslybelievedthatthesupernovaexplosionisasplendidfuneralofadyingstar.Infact,newastronomicalobservationsandtheauthor’stheoreticalstudieshaveshownthatintheprocessofastar’snever-endingevolution,numeroussupernovaexplosionsmayoccur,andsupernovaexplosionwillrunthroughmanystagesofstellarevolution.Whenevertheatmosphereofthestarbecomesverydenseanditssurfaceiscoveredwithathicklayerofmaterialagain,athermonuclearreactioncanbeignitedagain,causingasupernovaexplosion.Especially,whenthestarhasundergoneanumberofsupernovaeexplosionsanditssurfaceiscoveredwithmultiplelayersofsupernovaexplosionremnants,thecoreofthemassivestarmayundergosuddengravitationalcollapse,causingaviolentsupernova;whenastarisimpactedbyafallingcelestialbody,italsoproducesviolentsupernovaexplosions.
