Originally Posted by kurushio95
too bad the odds of that actually happening are ininitely slim. even if a monstrous asteroid were hurtling towards earth, satellites and telescopes would pick that thing up in time for us to launch just about every nuke we have at it
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Sure it's slim, but it's possible. If it does happen, the problem is we don't have any nukes that can go far enough to actually divert an asteroid enough to miss the Earth, and if we DO hit it, it'll likely just knock a chip off the rock, break it into large fragments (doing even more widespread damage) and shower us with our own nuclear fallout.
Scientists propose that the only real way to divert an asteroid threat is to have a year or so forewarning. This is difficult in and of itself as judging the movement and intersection of distant objects in space requires a LOT of accuracy in calculating. The best we can do currently is make a list of possible threats, track them and try to refine our data until we have a high enough probability to take action. Scientists would then need to and deploy a specially designed space-faring nuclear warhead that can intercept the asteroid months before impact. The warhead would detonate to the side of the asteroid, perhaps moving it's trajectory a small fraction of a degree off-course, turning impact into a near-miss.
There really is no chance for a last-second defense. We need plenty of forwarning, and astronomers aren't able to track every potential doomsday rock in the solar system. I'm not saying you should be practicing curling up in a fetal position and whimpering, but on the off chance a rock does show up coming at us real fast, we're in for some trouble.