BEETLE OF THE GODS

Defence lessons

The more fragile the incoming object, the more likely these airborne explosions are to happen.

In Southeast Asia, John Wasson has unearthed the remains of an event 800,000 years ago that was even more powerful and damaging than the one in the Egyptian desert; one which produced multiple fireballs and left glass over three hundred thousand square miles, with no sign of a crater.

"Within this region, certainly all of the humans would have been killed. There would be no hope for anything to survive," he said.

Barakat holds up one of the many,
huge chunks of glass in the desert

According to Boslough and Wasson, events similar to Tunguska could happen as frequently as every 100 years, and the effect of even a small airburst would be comparable to many Hiroshima bombs.

Attempting to blow up an incoming asteroid, Hollywood style, could well make things worse by increasing the number of devastating airbursts.

"There are hundreds of times more of these smaller asteroids than there are the big ones the astronomers track," said Mark Boslough. "There will be another impact on the earth. It's just a matter of when."

Horizon: Tutunkhamun's Fireball, made by production company TV6, was broadcast on BBC Two.

http://news.bbc.co.uk/2/hi/science/nature/5196362.stm

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