Highly unlikely is 1:250,000, you say? The Mega Millions Lottery odds are 1:175,711,536 and that happens what every few weeks or so?
Regardless though here’s a good vid with Neil deGrasse Tyson explains what would happen if it hit: [media=youtube]xaW4Ol3_M1o[/media]
(If it hits where scientists say it would hit if it did, Cali and the West Coast would be pretty fucked.)
What we’d do if we wanted to prevent it from hitting the Earth (basically, we could “tow” it by getting a ship close enough in front of it that the asteroid and the spaceship would be attracted by gravity and the ship could use its rockets to pull the asteroid away from the keyhole): [media=youtube]1-ReuLZ2quc&feature=channel[/media]
You might could tell, I’ve been following this thing for a little while. Craziest thing is that it’ll pass below orbiting satellites and there’s a good chance people could see it just by looking up. Pretty much, nothing for normal people to worry about (i.e. non-NASA, non-astrophysicists) until we get a little closer to the date when we’ll first see it.
Tyson says while that’s an option, what’s going to happen to all the debris and where would that fall?