Comments on "June 19, 2015"
Just a passing comment; Eudoxus doesn't have a well developed ray system compared to Copernicus. Wouldn't that make it Eratosthenian also? On the boundary between the Eratosthenian and Copernican, as Dr. Wood points out, would seem likely.
Here is an article from Sky & Telescope on dust particles above and around the moon. Since no one is sure how or why they exist, I speculate that they are left over from the putative collision between earth and a small planet the size of Mars that caused the formation of the Moon. The smoking gun of the Moon's formation. Ha! I wish. Take a look at it though it is an interesting article.