Just like the title.
A splinter fleet alien group arrives and long story short some human scientist explains to the president of his country that they might decide to weaponize asteroid against us at some point.
The president is troubled as asks what can we do. This is where you guys come in.
Can humanity now or in the near future, no more than 20 years, find a way to stop even a single asteroid? Provided that in this scenario that we can expect total human coordination and cooperation.
If why can't then why? And if we can then, obviously, what is it?
I mean I thought of ICBM but I'm not sure.
We know little of the aliens tech and that is a part of the problem. But we can expect them to be able to do so. Spoiler, not really but just thought it appropriate, they don't resort to asteroid dropping. But nevertheless I'd like your help in figuring out if it is possible to find a solution or not.
Question asked above, rest is extra fluff
The aliens might have planet killer type weapons. Why bother?
They don't. This group is like if a bunch of separatists that just got a fleet together and got here. Imagine of a population of a US state, just an example and the US is famous, decided to leave the state and settle on another planet. Do you expect the state to have aircraft carriers, fighter jets, and nuclear weapons?
Why would they destroy the earth, or won't it be more beneficial for them to negotiate, ...etc?
True and true. But this is just to maybe provide an answer to this question. Also way off topic.
Surely they have other weapons. They have FTL which is amazing and far beyond anything we possess.
Again this is off topic. But also no. They just arrive with ships and some "basic" weapons. Their galactic military does not park FTL capable planet killer capable ultimate doom ships with the keys in the ignition.
Can't they weaponize the ships?
Nope. The ships in particular are hardcoded to behave in certain ways. They can't even do the famous divert power from X to X. The ships "AI" treats them like children actually.
That would be a bad PR move. Surely they want to come in peace, and entice us with stuff, ...etc.
Appreciate it. But again, this is to answer this particular question.
You can't expect all the world to pool together. That is unrealistic.
Can I please have people in my story act this way? I mean, sure, we as a species can be stupid sometimes but this is a story and maybe I want smart leaders and global cooperation against our doom.
How do we even know that they plan or even think about if they don't try it?
You be the advisor to the President that says that! Hey, Mr. President. I don't know and I don't care. Tell me to come up with a plan once they drop an asteroid.
I don't mean to be rude or against anything useful. I appreciate all input even if slightly off topic. But sometimes things are way off topic. So please let's keep this to stuff that might actually help the core issue.
And as always a detailed no is as good as a detailed yes.