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Interstellar travel
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==== Helical engine ==== Proposed in 2019 by NASA scientist Dr. David Burns, the helical engine concept would use a particle accelerator to accelerate particles to near the speed of light. Since particles traveling at such speeds acquire more mass, it is believed that this mass change could create acceleration. According to Burns, the spacecraft could theoretically reach 99% the speed of light.<ref>{{Cite web|url=https://www.sciencealert.com/no-this-new-space-engine-isn-t-going-to-break-physics|title=NASA Engineer Claims 'Helical Engine' Concept Could Reach 99% The Speed of Light Without Propellant|last=Starr|first=Michelle|website=ScienceAlert|date=15 October 2019|language=en-gb|access-date=2019-11-12|archive-date=30 November 2019|archive-url=https://web.archive.org/web/20191130113556/https://www.sciencealert.com/no-this-new-space-engine-isn-t-going-to-break-physics|url-status=live}}</ref>
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