The Scientific Method
(media.kotakuinaction2.win)
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I'm being slightly hyperbolic on the never slow down. If you want to use a solar sail to go near the speed of light (the claim of the article) you need just as much energy to slow down somehow. And you have to carry that energy on your ship.
You might be able to slow down on a gravity well but I'm getting out of my practical knowledge and into my scifi knowledge now.