The Fermi Paradox says that alien contact with earth has not happened due to not being seen as an advanced civilization.

Alien Contact Possible Only with Advanced Civilization  

A new study published says that the arXiv database says that extraterrestrials choose the planets they want to go to.

Unless life has developed on several planets in the cosmos, then ETs are more interested in the ones in which there are indications not just about biology but technology, author of the study Amri Wandel, an astrophysicist at the Hebrew University of Jerusalem, did write in the document, noted Phys HUJI.

Though not peer-viewed yet, the Fermi Paradox explains that according to the universe's age, it would have advanced races that can travel light years and have been here on earth already, reported Live Science.

So far, the Milky Way, in all its expanse, has evidence these star-faring races have any indication of actually coming here, noted the Fermi Paradox.

Missing aliens might well have landed on earth in the old days, before humans developed or who were able to record the trip, as said by experts who've already decided to offer new explanations.

But long-distance space flight is a much more complicated idea. Presumably, alien contact has progressed too while back to be able to reach the earth.

Or they might have deliberately chosen not to start investigating the universe. They could have even obliterated themselves as advanced civilizations.

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The Fermi Paradox

Wandel gave another intriguing option to go after why ETs are not here. It's because life is teeming in the Milky Way galaxy.

Should any of these rocky worlds orbit where life can exist, this civilization would not waste time sending messages to every corner of the cosmos, talking to primitive alien algae or amoebas.

If life exists all over, they are looking for a technology of any kind wielded by other worlds. However, the tech is not easy to detect, like the earth has been sending radio waves out to space only recently. That would be in the 1930s, to be exact.

Theoretically, all these radio signals would have reached about 15,000 stars with their orbiting ex-worlds. It is only a small number compared to the 400 billion stars in the spiral galaxy. Wandel added that messages must cross interstellar space for a very long time. For example, it takes about 50 light years to get any signal from the earth.

Worse still, the oldest existing radio signals were not intentionally telecast into space, and they're so unintelligible after around one light-year that aliens would not be able to differentiate them, as shown by Universe Today.

Wandel discovered that unless intelligent societies are very plentiful, with much more than 100 million technically sophisticated planetary bodies in the Milky Way, it is probable that earth's messages have not yet reached another form of advanced life.

Nonetheless, as our planet skylights more and more radio traffic, it becomes more likely that Humanity's science and technology signals will eventually reach intelligent audiences.

Based on the research, there may be no advanced life within 50 light-years of earth. Based on Fermi Paradox says that alien contact needs advanced civilization to attract intelligent life.

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