Sun-powered lasers could vaporise asteroids before they get close to earth

Lasers powered by sun could protect Earth from any threatening-looking asteroids by destroying them before they can get too close, U.S. researchers have suggested.

Asteroids threatening earth to be vaporized like in Star Trek

As an asteroid readies for a fly-by of Earth on Friday, two California scientists have proposed a system that could eliminate a threat of this size in an hour.