@Rainmaker1973 Game over when (not if) Earth gets hit by an object of that size
@Rainmaker1973 当（不是如果）地球被那个大小的物体击中时游戏结束
@Rainmaker1973 Game over when (not if) Earth gets hit by an object of that size
@Rainmaker1973 当（不是如果）地球被那个大小的物体击中时游戏结束