For me there are two things that I just love in astronomy: pretty pictures and violent collisions. When the two come together, you get amazing images like this.
This incredible image is of something careening through Saturn's rings. Whatever this object is, as it's sailing though the rings, it's dragging a trail of debris behind it. The long shadow is being cast because Saturn's rings are almost edge on towards the sun. The exact process that created this dazzling effect still seems to be a mystery. For more on this check out Phil Plait's blog. Whatever it is it's awesome. This is why I love science.