APOD #2 on Antennae Galaxies

In the constellation Corvus, latin for Crow (it was associated with Apollo), two galaxies are fighting it out. The crow was not originally named because it looked like a crow, but rather because it reminded viewers of the sky of the fable about Apollo, which involved a crow, watersnake, and a cup.

The two galaxies are colliding, but there is no actual collision between stars. This is because galaxies are mostly empty space, with the chances of two stars colliding being very slim. The dust of the galaxies does, however, collide. The collision of dust creates massive molecular clouds which cause the rapid birth of millions of stars. Galaxy collisions usually takes hundreds of millions of years to fully merge with one another.