As the craters are so much bigger than the impactors, the twin impactors couldn't be touching but have to be separated before impact. The point where they hit must be in the center of the craters.
Really nice pictures, thanks for the link. /Göran Greg Redfern wrote:
My OWN guess (SWAGS are allowed/encouraged here!) is a dual impact at the exact same time with the impactors closely aligned - perhaps even touching or loosely bound. Ejecta is squeezed out and a wall is formed at the intersection of the two craters' point of outer wall intersection . Messier A & B on the moon are thought to be dual impactors but they are spread apart a bit. Fascinating as Spock would say. Greg Redfern
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