Contains:  Solar system body or event
Double trouble: Messier A, Andre van Zegveld

Double trouble: Messier A

Acquisition type: Lucky imaging
Double trouble: Messier A, Andre van Zegveld

Double trouble: Messier A

Acquisition type: Lucky imaging

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Description

Messier A crater, located in Mare Fecunditatis, presents an interesting puzzle. The main crater is beautifully preserved, with a solidified pond of impact melt resting in its floor. But there is another impact crater beneath and just to the west of Messier A. This more subdued and degraded impact crater clearly formed first, and so is labeled Impact 1 below, with Messier A following as Impact 2. But what interval of time separated these two impact events? Perhaps Impact 1 occurred thousands of years or more before Impact 2, and was just unlucky to have a similarly sized impact crater form nearly directly on top of it.

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Double trouble: Messier A, Andre van Zegveld