In recent decades, scientists have been struggling to find possible alien life, eager to find smart alien species one day.
Judging from the current discovery, perhaps we need to expand our exploration scope beyond the solar system, which is difficult for our solar system to have life except the earth.
The universe is so big that perhaps everyone here will never see alien life in their lives, but for scientists, they firmly believe that there must be advanced alien species somewhere in the universe. If this alien species appeared billions of years ago, it means that they will be one billion years ahead of human civilization and have an extremely developed technological level.
Now humans have built many radio telescopes on the earth to listen to signals from alien civilizations. At the same time, there are countless TV stations and broadcasts on the earth, and these signals will spread to the vast starry sky. Will there be alien civilizations listening to the signals sent by humans?
Considering that the radio technology used by humans has only a hundred years of history, it means that the signals sent by humans can only spread to the universe more than one hundred light years away at most. In the vast universe, more than one hundred light years is too trivial. The possibility of aliens in the range of more than one hundred light years is not very high.
Although humans are listening to alien signals in various ways, we have not received any valid information so far. But there is no evidence, which does not mean that aliens must not exist. Considering that the Milky Way alone has hundreds of billions of stars and planets, it is unlikely that there is only a smart species like humans in the universe.
But here is a possible fatal error: what if aliens had long stopped using radio? Or if the form of aliens exists beyond imagination, we cannot detect them?
If this is true, the aliens will never be found unless we change the strategy.
In our inherent thoughts, aliens should have the appearance of humans, at least similar to humans. But no physical law suggests that aliens must be similar to humans.
Perhaps, aliens only exist in some mechanical form. They have long been to Earth. Only because they are too small, it is difficult for our naked eyes to detect it.
Just look at today's human technology and you will know. Intelligent technology is booming. In the near future, humans will create very intelligent micro robot , such as nanorobot , to perform various tasks.
Scientists predict that by around 2030, half of the living things and half of the non-living life forms will appear on the earth. If humans could do it, perhaps aliens would have done so long ago.
Perhaps this tiny alien life form has existed in your back garden, but you just haven't discovered it.
