...within our solar system, that is!
"Almost 400 years ago, German astronomer Johannes Kepler observed comet tails being blown by what he thought to be a solar "breeze." This observation inspired him to suggest that 'ships and sails proper for heavenly air should be fashioned' to glide through space."
You can still track and see the solar sail on the web link below between February 25 and March 7 (three days from this posting). The You Tube embed has been disabled, but the video from '08 is phenomenal.
NASA NanoSail-D Homepage
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