http://io9.gizmodo.com/why-are-there-square-craters-forming-on-the-moon-1538860785
https://www.google.ca/search?q=square+craters+on+the+moon&safe=off&espv=2&biw=1922&bih=943&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjZsqyW0dnOAhVGw2MKHaudA9IQsAQIKw&dpr=1
https://www.google.ca/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=square%20craters%20on%20the%20moon
https://www.google.ca/search?q=square+craters+on+the+moon&safe=off&espv=2&biw=1922&bih=943&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiDi8Gl-NnOAhVE9mMKHUH3DzoQsAQIKw
https://www.google.ca/search?q=square+craters+on+the+moon&safe=off&espv=2&biw=1922&bih=943&source=lnms&sa=X&ved=0ahUKEwiBp5yh-NnOAhUW72MKHZxIBe8Q_AUIBSgA&dpr=1
