An far more advanced alien civilization heading your way intent on destroying you and will arrive in 400 years. How do you prepare for that?
Yes, I am watching 3 body problem. 🤣
I would think you need to put maximum investment into physics / tech right away. You'd want nuclear propulsion engines, some sort of biodefense plan perhaps.
IMHO if et does come there will be no much we can do initially. They will be years ahead of us in every aspect.
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