This one's more familiar, but too lovely to skip. In 2006 Hubble captured the Antennae galaxies merging, and billions of star births beginning in the midst of the collision. The two orange dots are the cores of the old galaxies. Pink is hydrogen; blue the star-forming regions.
This image is also a look into the future. In a few billion years our own Milky Way will smash into our neighbor galaxy, Andromeda, and perhaps it will look something like this to the aliens watching from afar.