> On 2021-09-15 6:22 PM (-4), Samuel B. wrote:
>> "A" points to three features I suspect might have been produced by asteroids
>> scraping the surface. Notice how they seem to have occurred on the sides or
>> upper portions of a (really large) sloping hill? To me that indicates they were
>> perhaps caused by asteroids hitting the moon at glancing angles... But I can
>> definitely see how they could have been caused by collapsed lava tubes.
> I'm guessing rills; if not that, collapsed lava tubes. It's not
> intuitive, but as far as I know, impact craters are always circular,
> regardless of impact angle. If anything, a glancing impact might create
> a series of craters, rather than a linear gouge.
There are a very few craters that are not circular. You can count them
on your fingers. When the impact angle is extremely shallow, the crater
can get elongated.
I've seen photos of three of those.
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