Thumpalumpacus
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Another thing that I love is how this crap is turned into a gold mine by Hollywood fellas. That's ok, it's entertainment, good action movies with all-american heros. But there's no science behind them.
Take Armageddon with Bruce Willis, all I can say is "Oh God!" every time I see it.... An asteroid the size of TX can't hide from the sun, can't hide from other planets, it would be detectable in one way or another, if they detected Apophis, and that's nothing compared to that huge thing in the movie.... enough said.
All that NASA would need to do is to park a probe near the huge rock and let it be, the influence of the probe would, over the years, deviate the rock just a bit from its course so it'd miss us completely.
But there are no action heros there, no cool special effects, and no end of the world crap we apparently fear but love to hear about.
I tried explaining to my ex- that exploding an impactor would likely worsen the effects of the impact by spreading them out. As you say, park a probe next to it. If you need quicker results, affix an engine or solar sail to it.