既然外星人的踪迹几乎无处不在,那么我们如何寻找外星人呢?一些科学家认为,如果确实有地球外高级文明存在的话,他们在日常活动中一定会有无线电波发射出来,正像人类在通信广播和科学活动中会有无线电波飞出地球一样。同时,如果他们也想寻找知音的话,还会主动向外发射进行联络的无线电波。因此,监听从地球以外传来的无线电波是寻找外星人的一种可靠方法。自本世纪50年代以来,美国、日本、苏联等国已有几十个监听站在收听是否有外星人发出的无线电信号。1960年,美国康奈尔大学的天文学家德雷克搞了个“奥兹玛”计 Since alien traces are almost everywhere, how do we look for aliens? Some scientists believe that radio waves are bound to be emitted in their daily activities if there is indeed a high-level civilization outside the Earth, just as humans There are radio waves that fly out of Earth during communications and radio and science activities. At the same time, they also take the initiative to launch outbound radio waves for contact if they also want to find a friend. Therefore, listening to radio waves coming from outside the Earth is a reliable way to find aliens. Since the 1950s, dozens of monitoring stations in the United States, Japan, the Soviet Union and the like have been listening to radio signals from aliens. In 1960, Drake, an astronomer at Cornell University in the United States, made an “Ozma” plan