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Here's the link to the actual letter, for any one curious
it's worth a read. Though, ask yourself... given the capability of interstellar travel, and knowing humans had the psychotic tendency to nuke themselves... multiple times... Would you visit here on vacation?
If you had the tech for FTL travel, you could destroy any planet with a single ship.
Just kamikaze it and your target literally couldn't see it coming.
It makes a nuke look a balloon popping.
If they existed and knew about humans, and for some reason were scared of us... First contact would be Earth getting vaporized.
It would be the equivalent of a human putting down a rabid racoon to that species.
We have mathematically worked out near light speed travel, we just lack the energy requirements to test it currently. There are two methods proposed, one being riding a wave we create and the other riding under space(this one was way more confusing). The wave one would accumulate debris ahead of the wave so you aim at a planet then stop short propelling everything the wave has gathered at near light speed into the planet, instant obliteration. We are trying really hard to solve fission which is the only thing holding us up right now. Optimistically we might see a practical test in our life time albeit very late into our lives.
No we haven’t. There is no known mechanism to create an alcubierre drive.
At the risk of being dismissive, there’s no known way to mess with things in such a manner- nevermind enough understanding to say what happened to debris in the path.
What we have are hypothetical models that assume we have these things. But everyone acknowledges they’re purely speculative. (Fun, even possibly useful, but speculation all the same.)
ELI5 how we go under space?