Astrophysicist Amri Wandel of the Hebrew University of Jerusalem has proposed a new explanation for why humanity still hasn't made contact with aliens.. He thinks intelligent aliens just don't find Earth interesting enough, reports Live Science..

The scientist suggests that highly intelligent aliens are not interested in planets on which life simply originated and exists. If we assume that there are several such planets in the Universe, then aliens will be interested not only in life itself, but in its high-tech manifestations.

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During the study, Wandel tried to explain the Fermi paradox. It is that, given the age of the universe, it is likely that intelligent aliens should already be capable of long-term space travel.. If it is available to them, then they should have already visited the Earth. Since this did not happen, this is evidence that intelligent aliens do not exist..

According to Wandel, this paradox can be explained by the fact that life is quite common in the Universe.. If there is life on the many rocky planets orbiting a star's habitable zone, aliens won't waste their resources sending signals to everyone.. This may end up with them coming into contact with algae or amoebas..

If life is common, aliens are more interested in traces of technology, but they are hard to detect.. The Earth began to emit signals that can be detected from space only in the 1930s.. Theoretically, they have already reached 15 thousand stars and their planets, but this is a small number compared to the 400 billion stars of the Milky Way.. In addition, it also takes time to receive a response.. Only inhabitants of planets around stars that are 50 light years away could answer at the moment..

In addition, the first radio signals from Earth were not intentionally transmitted into space..

Therefore, at a distance of one light year from the planet, they should have already been so distorted that aliens could not detect them..

Wandel believes that if intelligent civilizations are not very numerous, it is likely that Earth's signals have not reached another form of intelligent life.. However, over time, and as our planet emits more and more radio signals, it becomes more likely that Earth's technological signals will find intelligent listeners..