Could a “Deathstar” someday defend Earth against incoming threats from space?

Last Friday, asteroid 2012 DA14 — half a football field long and weighing about 190,000 tons — missed plane Earth in a fly-by. Far smaller and therefore harder to detect was the 50 foot long asteroid that injured more than 1,000 Russians when it stuck a few hours earlier.

What can we do about these dangerous asteroid threats? Options on the table include detonating a nuclear weapon near the surface or below a threatening object, “Armageddon” style, or slamming a spacecraft into it to knock it off course.

Two California scientists have a better idea for how to save the world: a Deathstar, straight out of “Star Wars.”

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