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Is there science and technology available today that would, in principle, allow accelerating a macroscopic object to relativistic speeds?

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  • $\begingroup$ What bounds do you want for "Relativistic speeds" ? $\endgroup$ – Yuzuriha Inori Apr 11 '18 at 16:25
  • $\begingroup$ I would say something like ~50% of speed of light would count as relativistic $\endgroup$ – Maxim Umansky Apr 11 '18 at 16:36
  • $\begingroup$ The Breakthrough Starshot project aims at 20%t of lightspeed using laser propelled micro-probes. Still mostly on the drawing board, but seriously intended as doable within 20 years or so. en.wikipedia.org/wiki/Breakthrough_Starshot $\endgroup$ – Anders Sandberg Apr 11 '18 at 17:40

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