Glob of asphalt tar floating on surface.
Natural Seepage:  Oil and tar slick line.
Hubble telescope image of a nebula, or a severe storm system in the night sky?  
It's actually mousse, a frothy mixture of oil and asphalt tar on the ocean surface at natural oil seep in the Santa Barbara Channel.
Snowy Egret (Egretta thula) gives a "high five."   (It looks like tar stains on its flanks).
Glob of asphalt tar floating on surface.
Glob of asphalt tar floating on surface.
Glob of asphalt tar floating on surface.
See photo in original gallery.