I know that this is Bad Astronomy's usual bailiwick, but I had to post this. It's a glint of sunlight reflecting off the surface of a lake of liquid hydrocarbons on Titan, a moon of Saturn. When I look at it, I wonder what diesel-fueled creatures might be swimming below. More details here.
A Glint From Across The Solar System
Discover the lakes of liquid hydrocarbons on Titan, Saturn's moon, and the glint of sunlight reflecting off their surfaces.
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