A Bajoran lightship with solar sails
A solar sail is a structure that forms a method of propulsion, based on the reflection of photons.
Bajoran lightships were equipped with solar sails. It was discovered that these sails also made them capable of faster-than-light speeds and interstellar travel, due to the presence of tachyon eddies in the Bajoran system. The Bajorans used solar sails as early as the 16th century, and continued to do so until as late as the 21st century. (DS9: "Explorers", "Accession")
Benjamin Sisko built a lightship after a visit to Bajor, and took it out into space with his son, Jake Sisko, as a travelling companion. (DS9: "Explorers", "Accession")
See also: Bajoran lightship