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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?