Solar wind was charged particles emitted by stars. They could be used to travel through space, pushing an object along like a sailboat.
The ships in the race for Enlightenment travelled by solar winds. The Buccaneer was designed to be able to move in the slightest breeze of solar wind. (DW: Enlightenment) The Veltrochni Dragon cruisers also travelled by harnessing solar winds. (MA: The Dark Path)
The Isolus naturally travelled through space via solar winds. (DW: Fear Her)
Kastria was protected from solar winds by a barrier set up by Eldrad. After he shut it down, the planet was ravaged, leaving it barren and lifeless. (DW: The Hand of Fear)
