crash of lead ions creating temperatures of over 10 trillion degrees and exploring the very edges of matter (in the Large Hadron Collider and pictured above). And NASA photographs from a comet fly-by.
Update, Wed. Nov. 10. Related to the theme: I read this last week but have finally seen the picture. As a photo, seemingly unimpressive, but then this is an image of a single atom. Photo by a University of Tokyo team.