Tidal bridges and tails
= Tidal bridges and tails
Extended <stellar structures> drawn out by time-dependent gravitational interactions between <galaxies>. Close, prograde encounters can coherently perturb rotating discs. Restricted particle calculations demonstrate that the structures need not be evidence of direct star-star impacts.<Galactic Bridges and Tails by Alar Toomre and Juri Toomre>[1972 abstract and §II]{ref}