Paul LaViolette concludes that the Younger Dryas event was not caused by a meteorite or comet strike, but by a "galactic superwave". He writes in 'Earth Under Fire: Humanity's Survival of the Ice Age':
"The core of our Calaxy periodically enters an explosive phase during which it generates an intense wind of cosmic ray particles (electrons, positrons, and protons). the total energy generated over the duration of the event is equivalent to that released from five to ten million highly energetic supernova explosions. These outbursts recur about every ten thousand years and can last anywhere from several hundred to several thousand years. ... One such cosmic ray volley passed through the solar system toward the end of the last ice age and for several thousand years injected large amounts of cosmic dust. This dust, in turn substantianlly altered Earth's climate through its effect on the Sun and sunlight transmission through space." (p 67)
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