Tachyon eddies are naturally-occurring streams of tachyons found throughout the Bajoran system. Although normally unnoticed by spacecraft, these tachyon eddies are capable of propelling a solar sail spacecraft to faster-than-light speeds because of their large surface area-to-mass ratio. In the 16th century, tachyon eddies allowed Bajoran lightships to sail from Bajor to Cardassia, a distance of several light years.

In 2371, a replica Bajoran lightship, piloted by Benjamin Sisko and his son, was caught by a tachyon eddy and swept to Cardassia in the same manner. (DS9: "Explorers")