My high school students were hounding me about aliens today, trying to get my opinion on what I would do if we were invaded by a race looking to exterminate us. They suggested we maintain global nuclear stockpiles for this purpose, just in case. But I don't think we could even launch a nuclear attack against aliens...Unfortunately, I had to shoot them down on these highly scientific grounds:
If this race has the ability to travel the galaxy/universe on spacecraft (and are able to solve the technological and physics-related issues associated with high-speed deep space travel), suffice to say they've probably got near infinite energy sources or, to say the very least, technologies that would make us look like amoebae.
Thus their weaponry would likely be something we have never seen: I figure the likelihood of them using any sort of "conventional" solid projectiles would be slim: I'm thinking chemical and biological, lasers, plasma, microwaves, sound waves, EMPs, electricity, nuclear energy, etc.
I suspect we wouldn't have a chance or the ability to fight...
Why wouldn't they simply fry all life here with a giant microwave from space, a nuclear attack, a supervirus, radiation...?
...Unless they were coming to enslave us and needed us alive. Damn, now that changes everything.
...Or unless they only wanted to exterminate humans but keep other species intact. In this case, disabling our electronics with some sort of EMP attack would be the smartest first step. But maybe I'm still thtinking like a human and even a super-EMP is crude to them...
Man, I love teaching....