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Sioux Falls Scientists endorse Mega Disasters: Comet Storm
for describing the comet storm that caused the mass extinction
of all human and most animal life in North America 13,000 years ago.

Mega Disasters: Comet Storm

Mega Disasters: Comet Storm (2008) - 50 minutes
Mega Disasters: Comet Storm  at Amazon.com

13,000 years ago, a large comet exploded over eastern Canada unleashing a mass of burning fragments that ignited a mega storm of fire spreading for thousands of miles. Nearly every living thing on the North American continent was destroyed, including an ancient civilization known as the Clovis.

3-15-19 Huge meteor explosion over Earth last year went unnoticed until now
A meteor caused a massive explosion over Earth last year, but nobody noticed until now. It is the second-largest recorded impact in the past century, after the meteor that exploded over the Russian region of Chelyabinsk in 2013. The giant fireball hit at 2350 GMT on 18 December over the Bering Sea, a part of the Pacific Ocean between Russia and Alaska. Peter Brown at the University of Western Ontario, Canada, spotted the meteor in measurements picked up by at least 16 monitoring stations globally. The meteor was 10 metres in diameter, had a mass of 1400 tonnes and impacted with an energy of 173 kilotons of TNT, he wrote on Twitter. The impact energy was about 10 times that of the atomic bomb dropped on Hiroshima in 1945. The meteor exploded at altitude above Earth’s surface, says Alan Fitzsimmons of Queen’s University Belfast, UK. “It would have been quite spectacular,” he says. The explosion was detected by infrasound stations around the world, which pick up low-frequency acoustic waves inaudible to humans. These stations were initially set up during the cold war to detect nuclear explosions. It is the third-largest impact in modern times, after Chelyabinsk and a massive explosion that occurred in Siberia, Russia, in 1908. Known as the Tunguska event, the air burst flattened an estimated 80 million trees over an area of more than 2000 square kilometres. “When you see these infrasound waves, you know immediately that there has been an impact or a large release of energy,” says Fitzsimmons. Triangulating the location and source of an explosion requires combining pressure wave data from multiple monitoring stations, which may explain the delay in the data being made public. The Bering Sea explosion was also picked up by US government monitors that detect fireballs: their sensors pick up electromagnetic radiation in the form of infrared and visible light.

Mega Disasters: Comet Storm

Sioux Falls Scientists endorse Mega Disasters: Comet Storm
for describing the comet storm that caused the mass extinction
of all human and most animal life in North America 13,000 years ago.