Solar wind

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. (TV: Enlightenment) The Veltrochni Dragon cruisers also travelled by harnessing solar winds. (PROSE: The Dark Path)

The Isolus naturally travelled through space via solar winds. (TV: 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. (TV: The Hand of Fear)