Colossal Lunar Impacts near the south and east shores of Mare Imbrium (Bruce Rohrlach)

Contains: Solar system body or event

Colossal Lunar Impacts near the south and east shores of Mare Imbrium

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Colossal Lunar Impacts near the south and east shores of Mare Imbrium

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Mapping three colossal impacts near the southern and eastern shores of Mare Imbrium from Phillip Island last week.

3.1 to 3.9 billion years Archimedes slammed into the eastern part of Mare Imbrium creating an 83-km-wide crater.

3.2 billion years ago Eratosthenes impacted the southern margin of the basin creating a 59-km-wide crater.

0.8 billion years ago the Copernicus impactor struck the southern shores of Mare Imbrium creating a 95-km-wide crater.

But none of these three asteroid impacts even begins to compare to the gargantuan impact that created the 1210-km-wide Mare Imbrium, one of the largest impact features in the Solar System. Around 3.9 billion years ago a body (likely a planetesimal) estimated at 250 km +/- 25 km wide blasted out an impact crater around 100-km-deep through the lunar crust and into the lunar mantle, but which rebounded and synchronously, or later, filled with molten lunar rock - forming the Mare ('sea' of molten basalt). The smooth areas in these 4 stitched images are the southern and eastern edges of Mare Imbrium.

The Montes Apeninnus is one of three mountain ranges around the edges of Mare Imbrium that were instantaneously uplifted by the colossal impact event. As high as they are, presently reaching 5.5 km in height, the Montes Apenninus are but the remnants of a once up to 7-km-high rim (of Himalayan proportions) around the Mare impact basin.

Four images with a ZWO ASI224mc cam and a TeleVue 5X Barlow on a Skywatcher 8 inch f5 Newtonian (focal length > 5000mm).

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Colossal Lunar Impacts near the south and east shores of Mare Imbrium

Colossal Lunar Impacts near the south and east shores of Mare Imbrium

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Colossal Lunar Impacts near the south and east shores of Mare Imbrium

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