Japan is going to launch a space yacht with solar sails.
Everything I know about solar sails I learned from that one DS9 episode where Sisko rebuilt one and got blown into Cardassian space, so I don’t really have much to add here except I hope that the Japanese one doesn’t get sucked through a tachyon eddy and into enemy space.
Not So Fast 
Totally just watched that episode last week. I’m hoping the japanese ship has completely manual rigging too, for that old-timey sailor feel.