Models the tidal interaction of two colliding spiral galaxies, similar to real mergers like the Antennae Galaxies. As the galaxies' centers of mass spiral inward under mutual gravity, each star is also weakly pulled toward the companion's core, stretching the outer disks into sweeping tidal tails and streams. Rendering uses two 9,000-point sprite-based galaxies with additive-blended glow textures, updated each frame with a simplified two-body gravity integration plus a per-star tidal-pull approximation (not a full N-body simulation).