Contains:  Solar system body or event
Imbrium morning culminating over Colorado dusk, Scott Denning

Imbrium morning culminating over Colorado dusk

Acquisition type: Lucky imaging
Imbrium morning culminating over Colorado dusk, Scott Denning

Imbrium morning culminating over Colorado dusk

Acquisition type: Lucky imaging

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Description

The Sea of Rains

One of the larger craters in the solar system at 1300 km across. The basin was excavated by the hypervelocity impact of a 250 km diameter protoplanet during the Late Heavy Bombardment almost 4 billion years ago. The impact created a ring of mountains 7 km high (23,000 feet). So much rock was removed that the mantle welled up in response, producing gigantic lava flows that flooded the basin with basalt 5 km deep and leaving just the little ring of island peaks as remnants of inner mountain rings long buried. 

Stack of the best 500 out of a 15,000-frame video shot at 2103 mm focal length last night at dusk. We finally got some clear skies but the moonlight is too bright for imaging galaxies. Might as well shoot the Moon!

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Imbrium morning culminating over Colorado dusk, Scott Denning