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.
科学家们仍然不确定 Hiawatha 有多年轻,但它足够新, 是唯一一个肉眼仍然可见的大小的陨石坑——至少, 如果你能透过冰看的话。