Glen Gusbing a ɔka United States Geologiɔal Survey Astrogeology (USGS) kuo ho ne Norther Arizona University a ɛwɔ flagstaff Arizona kaa sɛ Wɔn ahoɔhyeɛ su ɛnte sɛ aboɔdan a ɛwɔ asaase so na mmom ɛne amena a ɛda asaase ase ɛreyɛ ayɛ pɛ.