A team of British physics students calculated the size of explosive needed to carry out the scenario in the movie Armageddon, in which an asteroid was blown apart to prevent it from hitting the Earth -- at the last minute, of course. They found it would take a 96 petaton bomb -- about two billion times more powerful than the largest nuke ever detonated. (It would take less to nudge one away from its path if it's done while it's farther away.)NewsLI.com (Long Island) has advice on how to prepare for an asteroid "attack":
