People,
Look at the second image of Mesalla.
https://en.wikipedia.org/wiki/Messala_(crater)
The caption says "oblique view" of the crater, but the view is not oblique, it is from above. And the Sun's rays have to be from above, there is nothing oblique about them. Oblique rays cast shadows across crater floors. This view is so direct from above that the Sun's rays fill the crater with glare and show no shadows, and no shape of form. All form, even the crater walls, are wiped out by glare.
Dean
People,
Just some last musings on the crater Messala. Just to give you all an idea, the crater is 124 kilometers across, which makes the through/line which spans from the central peaks to the rim at the floor something like 60 kilometers long (37 miles)
I was observing it Friday night, but it didn't appear as a shadow. The Sun was getting along towards sunset, and the rays were low enough to make the straight line visible, but not low enough to create a shadow within the trough (ravine?) But the line itself was visible, I coudn't get a look inside, mostly because of the angle, but I could see the outline, the limits of the trough (trough according to Merriam Webster's Dictionay: "a conduit, train or channel ... long, shallow, often V-shaped). The limits were as stright as a line made by a fine-point Bic pen on paper using a ruler. This is NOT natural.
It is not like that straight channel seen on the floor of the Crater Petavius, which has very irregular sides.
https://en.wikipedia.org/wiki/Petavius_(crater)#/media/File:Petavius_crater_LROC.jpg
Dean
People,
I have seen Messala since the post above and the rim of the trough was more illuminated by a higher angle of the sunshine. Given this view, I saw that the rim was actually a bit rumpled, and uneven lengthwise. Nothing exagerated, it is just that it wasn't as smooth as the sides of a swimming pool, not like that.
Dean
#/media/File:Petavius_crater_LROC.jpg){kind=link}