Neil deGrasse Tyson decries the lack of action in dealing with the threat of asteroids and comets despite the overwhelming evidence, even before the Chelyabinsk event, of the devastation the impacts of such objects can have to life on earth:
Neil deGrasse Tyson decries the lack of action in dealing with the threat of asteroids and comets despite the overwhelming evidence, even before the Chelyabinsk event, of the devastation the impacts of such objects can have to life on earth: