Explanation : what lies at the bottom of hyperion ' s strange craters 说明:土卫七奇异的陨石坑底,到底藏了些什麽?
Hyperion is about 250 kilometers across , rotates chaotically , and has a density so low that it might house a vast system of caverns inside 土卫七的大小约为250公里,自转周期混乱,而且密度很,所以内部可能拥有一个广泛的洞穴系统。