Scientists still aren't sure how young Hiawatha is, but it is new enough that it is the only crater of its size still visible to the naked eye-- at least, if you could see through the ice.
学家们仍不确定希亚
萨陨石坑的年龄,但它足够年轻, 是唯一一个尺寸大到肉眼可见的陨石坑——当然, 前提是你能透过冰层看到它。