[oleg]

Originally posted by JurijD:
... Well recent calculations on the development of black holes have revealed that just before their formation as the star starts to collapse into themselves a HUGE SCHOCKWAVE or Gamma radiation is shot out into space. And the intestity of this radiation is such that it equals 10^9*10ˇ9*10^9 = 10^27 the ammount released in the most powerful hydrogen bomb we have.

So these guys went on to calculate that if such a black hole were to appear up to several hundred light years away from our solar system it would practicaly STERILISE all advanced life on our planet. (perhaps those bacteria deep inside the earth mantle would survive). quote: "It would be the equivalent of Hiroshima type bombs going off all over the planet."

Even if these calculationa are correct, you underestimate the effect of 100 LY. Simple calculation reveals 10^30 attenuation factor. At worst it will be like radiation 1000 km away from the bomb. Extensive hydrogen bomb tests in 50s and 60s proved that there is nothing to fear

Besides, the time duration odf star collapes is surely much longer than H-bomb explosion and the _intensity_ of the radiation will be very small indeed.