This messy collision of galaxy clusters is about 2.4 billion light years from Earth. More: https://chandra.harvard.edu/photo/2007/a520/index.html

A lot of kids (and maybe adults) are scared of the dark.  Most of us get over it once we realize there isn't a monster hiding in the closet or under the bed.  But then scientists announce another finding about dark matter and we all are back peering from under the sheets.