pdf Asteroid: Earth Destroyer or New Frontier مجانا للكاتب باتريشيا بارنز سفارني
It would take an asteroid the size of Vermont crashing into the Earth to wipe out all life on our planet. We can probably go to sleep tonight without worrying about this happening. Yet a significantly smaller asteroid -- say, one that spans 10 football fields -- could wreak enormous damage on life as we know it. Even if it struck in the middle of an ocean, violent flooding could drown millions of people. Asteroids this size pass between the Earth and the moon with disturbing frequency, writes Patricia Barnes-Svarney. This book nicely combines history, science and engaging speculation. It's a must-read for doomsday aficionados.