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It seems that GRBs are associated to supernovas and these beams of radiation are dangerous to much farther distance.
Originally posted by Jehosephat
A supernova has to be within 10 parsecs (30 light years) or so to be dangerous to life on Earth. This is because the atmosphere shields us from most dangerous radiations. Astronauts in orbit may be in danger if a supernova is within 1000 parsecs or so.
Better example would be Betelgeuse which might blow any second...
Originally posted by Scaart
say for example the middle star in orions belt was to explode, would we see that in real time or would it take an age for it to disappear ?