[The Comedian]

Yet another solar system smiley face...

[GeronL]

Always cool. I think Kevin Davis is on a trip but I’ll ing him anyway.

[attiladhun2]

Obviously proof of a now long-extinct Hermian civilization, who left this smiley-face as a jesture of an abiding sense of humor, even in the midst of a tragic demise.

[martin_fierro]

[SunkenCiv]

The discovery of multiple pit-floor craters adds to a growing body of evidence that volcanic activity was widespread in Mercury's past.

And when the surface is studied in detail (robotic mission to the surface, and then maybe a human crew someday) it will be shown to be nearly entirely the result of impact, same as the Moon, same as Mars.

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[SunkenCiv]

related:

• Astronomy Picture of the Day