E.g. The Voyager crafts took various assists from the planets. Sun being much more massive, wouldn't a spacecraft gain much more energy from such a flyby on the correct trajectory? If so then what fraction of $c$ could we achieve?
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1Voting to close, sorry, this is a duplicate of http://physics.stackexchange.com/q/128356/ also related to http://physics.stackexchange.com/q/134473/ – Nov 03 '15 at 13:38
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@count_to_10 I agree. Shall I delete this? – iceman Nov 03 '15 at 13:43
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Sorry about that, been there myself, imo yes, but it takes 5 votes so it's up to you. – Nov 03 '15 at 13:44