与附近恒星的交流?

因为光以固定的速度传播，所以信号需要很长时间才能到达我们这里。与外星人交流的基本问题是，最近的恒星在3-10光年之外。如果你说你好，这个信息要花三年时间才能到达外星恒星，再花三年时间才能回来。当然，另一个问题是外星人不一定会和我们有同样的交流方式。我们要做的就是发送数字信号，比如2 4 6 8。这就是交流的内容。第二部分是我们如何沟通?从科学上讲，我认为目前地球上有两种可行的方法。一种是标准技术，即使用无线电信号，我们用地球上最大的望远镜来收听。使用了直径300米的阿雷塞博望远镜。 Radio astronomers are currently working on the design of a radio telescope which will be ten times larger. Those telescopes will be mainly used to listen for extra terrestrial life. An alternative approach is to use lasers. Lasers have the advantage that they're highly directional. You could point high-powered laser at a specific star. One thing about technology is that we're in a period where technology's improving all the time. If you want to communicate with aliens and you think it's going to take many years to start this conversation it is possibly better to wait maybe 10, 20, 30 years until our technology improves significantly.