Hi Markus,
Which feature are you referring to as a possible lava tube? Are you are referring to the broad feature on the floor of Mare Crisium that follows it’s rim in a circular pattern? I think this is a slump line as a result of the surface lava within the Mare subsiding more than the areas immediately adjacent to the rim of the Mare.
You have captured the detail of this slump line really well. I have managed to see it once or twice visually. One’s timing needs to be just right to catch the fine shadows that reveal the slump line.
Quote:
Originally Posted by Stonius
Mare Crisium on the right with the crater aptly named 'Picard' (I'm pretty sure no man has gone there before, boldly or otherwise). Picard is 23km across. The smaller craters visible are about 10km across. I think there is detail down to a scale of around 1-2km. On the left is a largish crater called Cleomedes. I'm assuming that's a lava tube running around the rim, but someone may correct me.
cheers
Markus
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