A Prograde-Retrograde Galaxy Collision

Two spiral galaxies collide: one rotates clockwise, the other counterclockwise.

Galaxies Colliding: Edge-On View

Watch a small satellite galaxy fall into a large spiral galaxy.

Milky Way–Andromeda Galaxy Collision

A simulation of the collision between the Milky Way and Andromeda Galaxies.

Mergers of Gas-Rich Disk Galaxies

Two gas-rich galaxies colliding head-on.

The Milky Way's Gravitational Power

Watch as our Milky Way Galaxy turns an interloping dwarf galaxy into spaghetti.

Clusters of Galaxies: Dynamics & Structure

See clusters of galaxies change over time, including the structure and dynamics of the galaxies within them.

Centaurus A: Feeding a Black Hole

Movie showing the environment around a supermassive black hole.