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3. Gamma Ray Burst
Gamma Ray Burst ( GRB ) is scared than super flare from The Sun. Ground lives will be dead by this irradiation only for 10 milliseconds to several hours. It is suggested one of Mass extinction would be occurred by this attack ( O-S boundary ). Because THEY will do it whatever it will be able to occur, we must beware of.But fortunately, there is no star which can cause Gamma Ray Burst immediately. The Stars are about to explode now Betelgeuse ( 700 ly ) η Carinae ( 7500 ly ) VY Canis Majoris ( 38...