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Oct 28, 2017 at 13:41 comment added HopDavid I like this answer. It has always seemed to me the sun could deliver an amazing Oberth benefit if a near perihelion burn could be done. Am pleased that it has a name: The Kraft Arnold von Ehricke trajectory. XKCD had a pic but Randall didn't do this well.
Sep 20, 2013 at 5:51 comment added Mark Adler This answer is much better than the accepted one. To even get close to useful interstellar speeds, you would have to use a propulsive solar flyby. So the Voyager approach is nowhere near the fastest way to leave the solar system, as claimed in that other answer.
Aug 4, 2013 at 19:19 history answered Deer Hunter CC BY-SA 3.0