Gamma ray burst or hyperenergetic supernova near earth (26 dic 500000000 anni – 25 marzo 600000000 anni)
Descrizione:
Estimated time until a gamma ray burst, or massive, hyperenergetic supernova, occurs within 6,500 light-years of Earth; close enough for its rays to affect Earth's ozone layer and potentially trigger a mass extinction, assuming the hypothesis is correct that a previous such explosion triggered the Ordovician–Silurian extinction event. However, the supernova would have to be precisely oriented relative to Earth to have any negative effect.Aggiunto al nastro di tempo:
Data:
26 dic 500000000 anni
25 marzo 600000000 anni
~ 5883516 years
