[sig226]

IMO, they'll eventually determine that it is coincidental. it's unlikely, but there are millions of craters that we can study, so some of them should have some strange characteristics.

[sig226]

[BlueStateBlues]

Any evidence of a double ring impact on earth?

[Little Pig]

Mercury being so close to the sun, it may have stayed molten (or partially molten) longer. Since most of the double-ring basins are old (witness the many smaller craters overlaying the one in the pic), those double rings may be ripples formed when impactors struck a viscous or nearly-viscous surface that was right at the phase-change threshold. The energy of the impact may have heated the surface just enough to ripple, and it cooled again while the ripples were still separate.

[cripplecreek]

In my opinion, Mercury is our most boring planet. Not that it isn’t of scientific value, I just can’t get excited about it.

Looks like a great place to mine for heavy metals.

[gardengirl]

Those were some BIG raindrops! LOL

[Fido969]

IMO, they'll eventually determine that it is coincidental.

Like a "robin hood" arrow.

[SunkenCiv]

Thanks sig226.

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[SunkenCiv]

related:

• Mercury Flyby

[gleeaikin]

I thought double rings were a sometimes feature of large boloid impact craters, including here on Earth.