1) Impact crater on Mars 
[crater] Tugaske is a Martian impact crater, approximately 31 kilometres in diameter. It is located at 32.1°S, 101.2°W, south of the crater Dinorwic and southeast of the crater Virrat. It is named after a town in Saskatchewan, Canada, and its name was approved by the International Astronomical Union in 1991. According to a surface age map...