For new subscribers of the blog, I sometimes go slightly off-topic to share my geek love for all things space.
The Antennae Galaxies are currently colliding to form one giant galaxy. The orange regions represent the original cores of both galaxies and the old stars and filaments of dust represent the brown regions. The collision first started approximately a hundred million years ago and during the course of this merge, billions of stars will be born, represented in the bright blue regions.
What is most interesting is that the concept of colliding galaxies is fairly common and that most galaxies undergo at least one significant collision in their lifetimes. Our own Milky Way Galaxy will likely collide with the neighboring Andromeda Galaxy in the next several billion years.