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A Report Written by America's National Academy of Sciences Points Out, a Big Asteroid is Almost Certain to Hit Eventually - It Could Wipe Out Even Human Civilisation

Friday, July 5, 2013 5:01

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How Do you Stop an Asteroid Hitting Earth?

MOST asteroids in the solar system come nowhere near the Earth, and of those that do, most are so small that they burn up harmlessly in the atmosphere.

But, as a report written by America’s National Academy of Sciences points out, a big one is almost certain to hit eventually. Depending on how big it is, and where it comes down, it could wipe out a city, a country or possibly even human civilisation.

How Do you Stop an Asteroid Hitting Earth?

In February the world got a graphic reminder of the risk, when a small rock disintegrated above the Russian city of Chelyabinsk, killing nobody but injuring around 1,500 people.

That has focused attention on how to protect the Earth from future impacts, because asteroid strikes are one of the few natural disasters that humans have the power to prevent. But how?

Even small asteroids are massive and very fast-moving, so destroying them outright is not a realistic option. Instead, scientists aim to nudge them off course, so that they sail harmlessly past the Earth.

To do that, though, they must find them first.

NASA, America’s space agency, reckons it has found almost all the potentially Earth-threatening asteroids with a diameter of a kilometre or more (big enough to cause global devastation).

In 2005 it was given the task of finding 90% of those above 140 metres wide

The Economist

Read the very interesting article ”How Do you Stop an Asteroid Hitting Earth?” at:

http://www.economist.com/blogs/economist-explains/2013/07/economist-explains-1

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