Department of Ho-Hum

Or should that read Department of Uh-Oh?:

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.

There is more here.  You will find asteroid protection presented as the paradigmatic example of a public good in…um…my favorite Principles text.


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