Well all we know is that somebody invented the solar sails.
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Install solar panels instead.
Lower the sail and get out the oars.
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A sail on a spacecraft which uses light to push it, the way a
sailboat uses wind on its sail.
As far as I know, they're still only theoretical.
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Of course not.
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Yes. Any suitably large object can be used as a solar sail, so
that the charged particles push the sail away from the sun, just as
a ship moves in winds on Earth.