How building a telescope could send early warning of incoming asteroids
Washington: A physics professor has suggested that an early-warning telescope should be built to search for asteroids - about the size of a football field.
Michio Kaku, physics professor at City College of New York, said that the construction would cost just a few hundred million.
He said that the meteorite that struck Russia in 2013 is a "wake-up call", as if that had hit the Earth, instead of exploding in outer space, it would have hit the planet with the force of 20 Hiroshima bombs.
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