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McKinnon also says the 150-250 km impactor had to hit slowly in order to create the oblique shaped pattern of SP. NASA scientists define SP's oblique shape as the perimeter of the crater created by their slow moving impactor.
However, I see this Sputnik Planitia geological feature as the entire area that has no craters. This includes the uplands and the area around Norgay Montes and Wright Mons. I also include Viking Terra as a part of this geological process.
The softened land (whitw outlined area) that absorbs impacts by viscously relaxing, covering over the impact crater, is all within the same geological age (young) and is therefore influenced by the same geological processes that shape SP itself.
They fully understand that an impactor like this at a slow speed ---
Couldn't possibly create a subsurface bulging ocean like this. >>>>>>
Yet to force feed their scenario of an impactor creating a maximum 10 km deep SP they use their errant impactor idea to imply it created a bulging subsurface ocean (i.e. thin shell) along with a positive gravity anomaly.
According to them, the polygonal N2 cell sizes limit the potential depth of SP to 6 km so they claim SP nitrogen depth can't support a positive gravity anomaly but they want one so they force fit an impossible impact scenario to create an unreasonable positive gravity anomaly by claiming the impactor created a thin shell.