That's why we will be totally unprepared.
And wait until the sun's reflection makes the sky look like it has two suns; that will be a sight to behold.
And if the government did know, do you think they would tell?
Upset the masses so that they would step out of line?
I don't think so!
"US unprepared for an asteroid strike, scientists say" by John Johnson, Los Angeles Times | July 5, 2008
PASADENA, Calif. - Alan Harris, a senior research scientist at the Space Science Institute in Boulder, Colo., said the greatest danger does not come from the objects we know about, but from the ones we haven't identified.
In one example of the lack of attention the issue receives in Washington, Rohrabacher said, funding for the Arecibo, Puerto Rico, radio telescope, which searches for near-Earth objects, is in danger in next year's budget.
If and when scientists are able to identify a potential killer asteroid, the deeper question is how to deflect it. Ideas have ranged from using nuclear weapons to blow it up to sending a spacecraft that would use gravity to drag the object off its destructive path.--MORE--"
Like in the movies?
Also see: Asteroid Arrival: 2012
After the 2012 Asteroid
