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We don't have the capability to send anything there now. Sending even a tiny probe that is capable of communicating back to Earth from our closest stellar neighbor is beyond our current technology. People are actively working on it, but it's unlikely that we will have the technology to even send an unmanned probe to this star within our lifetimes. We might send a probe to Alpha Centauri, but it's even questionable whether it will be fast enough to arrive within our lifetimes.

Project Orion - riding nuke explosions - using existing tech/materials and those 100K nukes that both sides had at the peak of the Cold War would bring a 30K ton ship to the 5-10% of c. Curiously, getting all that 100K+ ton of hardware to LEO where one can finally start exploding the nukes seems to be more complicated task right now.

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