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To answer your questions, yes, it's possible to build a bomb that can wipe out all life on Earth,
Did you just not read my post at all ?
Please someone actually read this post before making any uninformed guesses.It seems I have some explaining to do. The blast and fragmentation of the nuclear weapons may outright kill you, or it may not- surprisingly even the big nukes, greater than one megaton in yield, don't flatten entire cities with their initial blast. It's what they set on fire during the detonation that really does the number.
Think of everything flammable in about five miles of the point of detonation (20MT weapon, rough guess) bursting into flames simultaneously. It generates a tremendous bonfire, with the flames consuming all available oxygen, and generating fierce winds that suck in towards the point of detonation- the hot air's going upward from the heat, and it's drawing in near-hurricane force winds to feed the flames.
It is this phenomenon that analysts are saying is the real killer- even if you happen to survive the initial blast and heatwave, you're going to most likely die in the firestorm that follows- out to a certain range, but it's much greater than the blast zone- about four times the diameter, and again- I'll have to search that site out and post a link for better accuracy.
As for fallout- give it two weeks or so to settle out- stay in your bunkers as much as possible until then, and don't look into the bright light! Radiation will be the highest at the points of detonation, and the fallout loses much of its radioactivity after the aforementioned two weeks. Still, can't just pop on down to the local pub to see how we fared in the "war", can't go to the hospital to get patched up or treated for the radiation sickness you incurred during the main delivery phases
The predicted fallout from radioactive material.
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