A spaceship for sure. It’d have a really advanced AI system onboard to keep track of the crew, cryosleep chamber so that even if the propulsion system stayed well below light speed, the crew might be preserved until it reached an extra solar destination.
Also, I’d probably invest in research in an Alcubierre Drive, so that we could get where we wanted to faster than light (it’s definitely worth googling a little bit about it 🙂 )
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