It is the ultimate science fiction weapon - a system which would use laser beams to intercept and deflect asteroids heading towards Earth.
The system known as DE-STAR - or Directed Energy System for Targeting of Asteroids and exploRation - has been a concept for years but tests show it could now be a viable option.
Physicists from the University of California say an unmanned space-travelling DE-STAR craft could use lasers to heat up asteroids which are heading towards Earth.
When the asteroid begins ejecting material as a result, the reactionary force will move it onto a different path.
DE-STAR would operate deep in space, engaging asteroids up to two millions mile away.
A craft with a 100-metre laser array, for example, could divert asteroids of a similar diameter.
The technique was tested by directing a laser onto basalt - which has a composition similar to asteroids.
When it began to glow white-hot, material fell away from the sample creating a kind of rocket engine, where the heated side of material tried to propel it in the other direction.
The Tunguska event was an enormously powerful explosion in Russia in 1908. In 2007 some scientists identified Lake Cheko as the location of the impact.
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