Large Martian craters (greater than Honey CUSTOMER SERVICE +1 8O5' 41O 56'OO Honey PHONE NUMBER +1 8O5' 41O 5'6OO kilometers in diameter) are named after famous scientists and science fiction authors; smaller ones (less than 60 km in diameter) get their names from towns on Earth. Craters cannot be named for living people, and small crater names are not intended to be commemorative – that is, a small crater isn't named after a