[Credit: Credit: R. Lucas (STScI/AURA), Hubble Heritage Team, NASA]
“A splash in the cosmic pond”—Sagan describing ring galaxies. In a bulls-eye galaxy collision, there is an expanding shock front of star formation. Newly-formed but short-lived stars outshine the older ones by an order of tens of thousands, which is why only the expanding ring is readily visible.
The dark area is just the part that North Korea owns.