Collision of Milky Way and Andromeda galaxies: a simulation

- This event will take place 4 billion years from now, and will last several billion years to complete.

- Because stars in each galaxy are so far apart, very few stars may ever collide. However, some stars will be thrown out of their galaxies at high speed due to the effect of gravity.

(Taken from Cosmos episode 3: When Knowledge Conquers Fear)

For teaching: astrophysics