Gamma ray burst or hyperenergetic supernova near earth (26 déc. 500000000 – 25 mars 600000000)
Description:
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.Ajouté au bande de temps:
Date:
26 déc. 500000000
25 mars 600000000
~ 5883516 years
