What galaxies are characterized by a long stretch of stars that extends out beyond the galactic disk?

Galaxies characterized by a long stretch of stars that extends beyond the galactic disk are known as "tidal tails." These features often occur as a result of gravitational interactions during galaxy mergers or close encounters, where stars are pulled from their original galaxies and form elongated structures. Tidal tails can provide insights into the dynamics and evolution of galaxies, as well as the distribution of dark matter in the universe.