![Der Mond](https://wp-media.patheos.com/blogs/sites/186/2015/12/800px-08.Sep_.2014_Mid-Autumn_Festival._15._Tag_des_8._Mondmonats_nach_dem_traditionellen_chinesischen_Kalender._Das_Mondfest_-_Mittherbstfest_14995589598-300x225.jpg)
(Wikimedia Commons; click to enlarge)
Common sense isn’t a reliable guide to the structure of the cosmos. Things are much, much more interesting than that:
Of course, in the image above the Moon appears to be surrounded by dark matter. Why didn’t we notice that before?