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Space Rock Onslaught

from The Guardian

Asteroids cause dozens of nuclear-scale blasts in Earth’s atmosphere

Many explosions stronger than Hiroshima bomb but most occur too high above ground to cause serious damage

Link to video: Planet Earth comes under fire from asteroids

Asteroids caused 26 nuclear-scale explosions in the Earth’s atmosphere between 2000 and 2013, a new report reveals.

Some were more powerful – in one case, dozens of times stronger – than the atom bomb blast that destroyed Hiroshima in 1945 with an energy yield equivalent to 16 kilotons of TNT.

Most occurred too high in the atmosphere to cause any serious damage on the ground. But the evidence was a sobering reminder of how vulnerable the Earth was to the threat from space, scientists said.

The impacts were recorded by the Nuclear Test Ban Treaty Organisation, which operates a global network of sensors set up to detect nuclear weapon detonations. None of the asteroids were picked up or tracked in advance by any space- or Earth-based observatory.

The former astronaut Ed Lu, speaking about the data at the Museum of Flight in Seattle, said: “While most large asteroids with the potential to destroy an entire country or continent have been detected, less than 10,000 of the more than a million dangerous asteroids with the potential to destroy an entire major metropolitan area have been found by all existing space or terrestrially operated observatories.”

[ click to continue reading at The Guardian ]

Posted on April 27, 2014 by Editor

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