Colliding Planets!

Imagine you have two stars in a close orbit around each other. Now, imagine each star has some planets orbiting them. What happens next? Planet fight! A planet's orbit in such a configuration is highly unlikely to be stable, so these planets are likely to collide with each other. When they do, this collision will form a lot of dust, which emits infrared light - similar to what was observed from a double star binary system. Go here and here to read more about it, and here to look at some nice artist renditions. Isn't the universe grand?