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Over the past 60 years, radio signals have been widely used to find signs of alien civilization, but in fact they are not the only medium that can find extraterrestrial life. Like lasers, they can also send messages between stars. Understandably, lasers can converge into very compact beams, tune to a frequency, and then penetrate the dust and gas in space. At the same time, any laser that eventually reaches the Earth may be very short, because they will not be sent to Earth, but will only be sent to Earth in a short time. The same is true for radios, but the difference is that people are more likely to use ultraviolet laser pens than radios in space scanning areas.