Gammasähvatuse põhjuseks arvatakse olevat kas neutrontähtede põrge või ülivõimsa supernoova (hüpernoova) plahvatus kauges galaktikas, mille tulemusena vabaneb enneolematu energia.
A hypernova — sometimes called a collapsar — is a particularly energetic core-collapse supernova. Scientists think a hypernova occurs when stars more than 30 times the mass of the Sun quickly collapse into a black hole.
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