JR4fJG Explanation Group 2: Type II and III intelligent civilizations are out there—and there are logical reasons why we might not have heard from them.
DYW&6+%,hO 第二组猜想：II、III型文明存在，他们用魔术般的方法不让我们找到他们。
%v<BE
tq Group 2 explanations get rid of any notion that we’re rare or special or the first at anything—on the contrary, they believe in the
Mediocrity Principle, whose starting point is that there is nothing unusual or rare about our galaxy, solar system, planet, or level of intelligence, until evidence proves otherwise. They’re also much less quick to assume that the lack of evidence of higher intelligence beings is evidence of their nonexistence—emphasizing the fact that our search for signals stretches only about 100 light years away from us (0.1% across the galaxy) and suggesting a number of possible explanations. Here are 10:
/NFm6AA] 第二组猜想和第一组猜想正好相反，他们相信平庸原则，银河系里一切（太阳、行星、智慧级别到有证据证明其他方面）的起始点都不会有稀有或特殊的东西。他们也不会急着去假设找不到更高级文明就说他们不存在，而是强调我们搜索信号的范围只有100光年（银河系直径的0.1%），第二组包含更多的猜想，列出其中十个：
Kr@6m80E5 7) Qq Possibility 1) Super-intelligent life could very well have already visited Earth, but before we were here. In the scheme of things, sentient humans have only been around for about 50,000 years, a little blip of time. If contact happened before then, it might have made some ducks flip out and run into the water and that’s it. Further, recorded history only goes back 5,500 years—a group of ancient hunter-gatherer tribes may have experienced some crazy alien shit, but they had no good way to tell anyone in the future about it.
,^&amWey 1）：超级文明很可能在人类出现之前来过地球。在所有事物的发展过程中，有意识的人类到现在只有5w年，时间轴上的小光点。如果以前超级文明接触过地球，那一定让鸭子疯跑进水里。有记录的历史只有5500年，一些原古狩猎部落可能见过一些可怕的外星人，但是他们没有好办法告诉后人。
